Pt with RLQ abdominal pain for several hours, tender with guarding. Lying supine with hips flexed, and pain is worse when hips are extended. WBC 14,000 and UA with 10-20 leuks/hpf and 1+ blood. Cause?
a. Appendicitis
b. Cholecystitis
c. Renal calculi
d. Gastroenteritis