input: The following are multiple choice questions (with answers) about medical knowledge.   We sought to determine whether patients with obstructive sleep apnea (OSA) had an objective change in aerobic fitness during cycle ergometry compared to a normal population. The most accurate test of aerobic fitness is measurement of maximum oxygen consumption (VO2max) with cycle ergometry. We performed a retrospective cohort analysis (247 patients with OSA) of VO2max from annual cycle ergometry tests compared to a large control group (normative data from 1.4 million US Air Force tests) in a tertiary care setting. Overall, individuals with OSA had increased VO2max when compared to the normalized US Air Force data (p<.001). Patients with an apnea-hypopnea index of greater than 20 demonstrated a decreased VO2max as compared to normalized values (p<.001). No differences in VO2max were observed after either medical or surgical therapy for OSA.   **Question:** Does obstructive sleep apnea affect aerobic fitness?   (A) Yes   (B) No   (C) Maybe
output: ['(C) Maybe <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Yes  (B) No  (C) Maybe <> possible answers', 'We sought to determine whether patients with obstructive sleep apnea (OSA) had an objective change in aerobic fitness during cycle ergometry compared to a normal population. The most accurate test of aerobic fitness is measurement of maximum oxygen consumption (VO2max) with cycle ergometry. We performed a retrospective cohort analysis (247 patients with OSA) of VO2max from annual cycle ergometry tests compared to a large control group (normative data from 1.4 million US Air Force tests) in a tertiary care setting. Overall, individuals with OSA had increased VO2max when compared to the normalized US Air Force data (p<.001). Patients with an apnea-hypopnea index of greater than 20 demonstrated a decreased VO2max as compared to normalized values (p<.001). No differences in VO2max were observed after either medical or surgical therapy for OSA. \n   Does obstructive sleep apnea affect aerobic fitness? <> context']