The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 59-year-old man complains of chest pain that has been present for 4 hours on the 5th day of hospitalization for acute myocardial infarction. 5 days ago, he had a burning sensation in his chest and discomfort in his left shoulder. Upon initial presentation to the hospital’s emergency department, he was diagnosed with an ST-elevation myocardial infarction and treated with alteplase. He has been under close observation since then. The patient now describes discomfort in his chest and left shoulder, somewhat similar in nature to what initially brought him into the hospital. A pulse of 86/min, respiratory rate of 16/min, and a blood pressure of 146/90 mm Hg are observed. Auscultation of the chest reveals no abnormal findings. The patient’s ECG is difficult to interpret. Of the following laboratory tests, an abnormal result of which would have the most diagnostic utility?   (A) Alkaline phosphatase   (B) Creatine kinase (CK-MB)   (C) Lactate dehydrogenase   (D) Troponin T
['(B) Creatine kinase (CK-MB) <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Alkaline phosphatase \n (B) Creatine kinase (CK-MB) \n (C) Lactate dehydrogenase \n (D) Troponin T <> possible answers', '  A 59-year-old man complains of chest pain that has been present for 4 hours on the 5th day of hospitalization for acute myocardial infarction. 5 days ago, he had a burning sensation in his chest and discomfort in his left shoulder. Upon initial presentation to the hospital’s emergency department, he was diagnosed with an ST-elevation myocardial infarction and treated with alteplase. He has been under close observation since then. The patient now describes discomfort in his chest and left shoulder, somewhat similar in nature to what initially brought him into the hospital. A pulse of 86/min, respiratory rate of 16/min, and a blood pressure of 146/90 mm Hg are observed. Auscultation of the chest reveals no abnormal findings. The patient’s ECG is difficult to interpret. Of the following laboratory tests, an abnormal result of which would have the most diagnostic utility? <> context@']