The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Most common site of esophageal carcinoma?   (A) Middle 1/3rd of esophagus   (B) Upper 2/3rd of esophagus   (C) Lower 2/3rd of esophagus   (D) Middle 2/3rd of esophagus
['(A) Middle 1/3rd of esophagus <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Middle 1/3rd of esophagus \n (B) Upper 2/3rd of esophagus \n (C) Lower 2/3rd of esophagus \n (D) Middle 2/3rd of esophagus <> possible answers', '  Most common site of esophageal carcinoma? <> context@']