A 76 year old woman is admitted with a three hour history of central chest pain. She smokes 20 cigarettes a day. Her symptoms resolved on arrival in the emergency department without treatment. Her blood pressure is 140/86, pulse 75/regular. Cardiovascular examination is normal. Her troponin is mildly elevated. What is the most likely diagnosis?
A) Acute inferior myocardial infarction
D) Non-ST elevation acute coronary syndrome