You respond to a 75-year-old female who is complaining of epigastric pain that feels like heartburn. The pain radiates to the right shoulder. Her vital signs are stable and she has a previous history of a myocardial infarction. She has prescription nitroglycerin tablets. She is most likely suffering from:
A) cholecystitis.
B) abdominal aortic aneurysm.
C) Mittelschmerz.
D) renal colic.