The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 39-year-old man seeks an evaluation in the emergency room due to an episode of syncope at work. He says that he has felt increasing shortness of breath while exercising over the past 6 months. He is a well-built man in mild distress. The vital signs include heart rate 98/min, respiratory rate 18/min, temperature 36.5°C (97.7°F), and blood pressure 135/90 mm Hg. The cardiac examination is significant for a harsh systolic ejection murmur at the left lower sternal border which is accentuated by forceful expiration against a closed airway. Palpation of the carotid artery shows 2 closely spaced pulses which occur during systole. Which of the following is most consistent with these findings?   (A) Aortic stenosis   (B) Cardiac tamponade   (C) Hypertrophic cardiomyopathy   (D) Third-degree heart block
['(C) Hypertrophic cardiomyopathy <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Aortic stenosis \n (B) Cardiac tamponade \n (C) Hypertrophic cardiomyopathy \n (D) Third-degree heart block <> possible answers', '  A 39-year-old man seeks an evaluation in the emergency room due to an episode of syncope at work. He says that he has felt increasing shortness of breath while exercising over the past 6 months. He is a well-built man in mild distress. The vital signs include heart rate 98/min, respiratory rate 18/min, temperature 36.5°C (97.7°F), and blood pressure 135/90 mm Hg. The cardiac examination is significant for a harsh systolic ejection murmur at the left lower sternal border which is accentuated by forceful expiration against a closed airway. Palpation of the carotid artery shows 2 closely spaced pulses which occur during systole. Which of the following is most consistent with these findings? <> context@']