A man was just admitted after experiencing chest pain and shortness of breath. Blood tests were sent while he was in the emergency department, and the nurse is evaluating the results. An elevation in...

A man was just admitted after experiencing chest pain and shortness of breath. Blood tests were sent while he was in the emergency department, and the nurse is evaluating the results. An elevation in which one of the following blood tests indicates that he is having an acute myocardial infarction?

a. Troponin

b. Cholesterol

c. Brain natriuretic peptide (BNP)

d. C-reactive protein (CRP)