input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** An investigator conducts a study to determine whether earlier detection of glioblastoma multiforme (GBM) in patients increases survival time. One subset of study participants consists of asymptomatic individuals who were diagnosed with GBM after undergoing a screening MRI of the brain. The other subset of study participants was diagnosed with GBM only after they developed symptoms. Results from the study show that the asymptomatic patients who were diagnosed with screening MRI had an average survival time that was 6 weeks longer than that of the patients who were diagnosed after symptom onset. Which of the following statistical biases is most likely to have occurred as a result of the endpoint selected for this study?   (A) Observer-expectancy bias   (B) Length-time bias   (C) Surveillance bias   (D) Lead-time bias
output: ['(D) Lead-time bias <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Observer-expectancy bias  (B) Length-time bias  (C) Surveillance bias  (D) Lead-time bias <> possible answers', '  An investigator conducts a study to determine whether earlier detection of glioblastoma multiforme (GBM) in patients increases survival time. One subset of study participants consists of asymptomatic individuals who were diagnosed with GBM after undergoing a screening MRI of the brain. The other subset of study participants was diagnosed with GBM only after they developed symptoms. Results from the study show that the asymptomatic patients who were diagnosed with screening MRI had an average survival time that was 6 weeks longer than that of the patients who were diagnosed after symptom onset. Which of the following statistical biases is most likely to have occurred as a result of the endpoint selected for this study? <> context']