The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 23-year-old man presents with sudden loss of consciousness while pitching in a baseball game. There is no history of injury. Consciousness is regained after cardiopulmonary resuscitation. Past medical history is negative for any neurological and cardiovascular problems. Physical examination reveals a prominent A wave on the jugular venous pulse and a double apical impulse. There are no audible murmurs. An S4 is present. What is the most likely diagnosis?   (A) Hypertrophic cardiomyopathy   (B) Aortic stenosis   (C) Takotsubo cardiomyopathy   (D) Restrictive cardiomyopathy
['(A) Hypertrophic cardiomyopathy <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Hypertrophic cardiomyopathy \n (B) Aortic stenosis \n (C) Takotsubo cardiomyopathy \n (D) Restrictive cardiomyopathy <> possible answers', '  A 23-year-old man presents with sudden loss of consciousness while pitching in a baseball game. There is no history of injury. Consciousness is regained after cardiopulmonary resuscitation. Past medical history is negative for any neurological and cardiovascular problems. Physical examination reveals a prominent A wave on the jugular venous pulse and a double apical impulse. There are no audible murmurs. An S4 is present. What is the most likely diagnosis? <> context@']