31. A typical symptoms of a) myocardial ischemia; b) dyspnea on exertion; c) ST
segment elevation or depression in the ECG; d) Q wave in the ECG. The above
items included in criteria for acute myocardial infarction are:
(A) a and b
(B) a, b, and c
(C) a, c, and d
(D)b, c, and d
(E) all of them