Appendiceal fecalith:

Which of the following is a useful marker for identification of platelet precursors?

a. VWF b. PF4 c. Phospholipase d. Factor V

A 20-year-old female presents with pelvic and back pain severe enough to miss work beginning with the onset of menses. Physical examination supports the diagnosis of primary dysmenorrhea. The most likely cause of her condition is:

a. lack of estrogen. b. stress. c. elevated prostaglandins. d. poor nutrition.