input: The following are multiple choice questions (with answers) about medical knowledge.   The purpose of this survey was to ascertain the most common surgical practices for attaining negative (tumor-free) surgical margins in patients desiring breast-conservation treatment for breast cancer to see if a consensus exists for optimal treatment of patients. We sent a survey to 1,000 surgeons interested in the treatment of breast cancer. Three hundred eighty-one surgeons responded to this survey and 351 were used for the analysis (response rate of 38%). Answers showed a large variety in clinical practices among breast surgeons across the country. There was little intraoperative margin analysis; only 48% of surgeons examine the margins grossly with a pathologist and even fewer used frozen sections or imprint cytology. Decisions to reexcise specific margins varied greatly. For example, 57% of surgeons would never reexcise for a positive deep margin, but 53% would always reexcise for a positive anterior margin. Most importantly, there was a large range in answers about acceptable margins with ductal carcinoma in situ and invasive carcinoma. Fifteen percent of surgeons would accept any negative margin, 28% would accept a 1-mm negative margin, 50% would accept a 2-mm negative margin, 12% would accept a 5-mm negative margin, and 3% would accept a 10-mm negative margin.   **Question:** Attaining negative margins in breast-conservation operations: is there a consensus among breast surgeons?   (A) Yes   (B) No   (C) Maybe
output: ['(B) No <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Yes  (B) No  (C) Maybe <> possible answers', 'The purpose of this survey was to ascertain the most common surgical practices for attaining negative (tumor-free) surgical margins in patients desiring breast-conservation treatment for breast cancer to see if a consensus exists for optimal treatment of patients. We sent a survey to 1,000 surgeons interested in the treatment of breast cancer. Three hundred eighty-one surgeons responded to this survey and 351 were used for the analysis (response rate of 38%). Answers showed a large variety in clinical practices among breast surgeons across the country. There was little intraoperative margin analysis; only 48% of surgeons examine the margins grossly with a pathologist and even fewer used frozen sections or imprint cytology. Decisions to reexcise specific margins varied greatly. For example, 57% of surgeons would never reexcise for a positive deep margin, but 53% would always reexcise for a positive anterior margin. Most importantly, there was a large range in answers about acceptable margins with ductal carcinoma in situ and invasive carcinoma. Fifteen percent of surgeons would accept any negative margin, 28% would accept a 1-mm negative margin, 50% would accept a 2-mm negative margin, 12% would accept a 5-mm negative margin, and 3% would accept a 10-mm negative margin. \n   Attaining negative margins in breast-conservation operations: is there a consensus among breast surgeons? <> context']