A 74 YO Male came into the office with the complains of epigastric pain 30-40min after eating, and pain doesn't relieve with antiacid tablet. Recently, he lost weight due to the fear of eating. His past medical history includes; Hyperlipidemia, Hypercholestolemia, and coronary bipass surgery. On his upper endoscopic exam all normal. The pathophysiology of the patient conditions closely relate to which of the following?
A. PUD.
B. Stable angina.
C. PE.
D. Crohn's disease.
E. Gastric CA.
F. Colon CA.

I am intersted in the why?