A 10 y/o boy has been having "bellyaches" for about 2 years. They occur at night as well as during the day. Occasionally, he vomits after the onset of pain. Occult blood has been found in his stool. His father also gets frequent, nonspecific stomachaches. Which of the following is the most likely dx?



a. Peptic ulcer

b. Appendicitis

c. Meckel diverticulum

d. Functional abdominal pain

e. Pinworm infestation