This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders in Menstruation, Subject name: Gynaecology & Obstetrics
Which of the following can occurs in ovary, rectum and appendix - 
Select and explain. 
A. Metastasis, B. Nebothian follicles, C. Para ovarian cyst, D. Endometriosis
D: Endometriosis
Answer: D: Endometriosis 
Explanation: Ans. is 'd' Endometriosis (Ref. Shaws, 13/e, p 439 (12/e, p 370)).Endometriosis is widely dispersed. It occurs anywhere throughout the lower pelvis. The common sites are ovaries*, cul-de-sac including the uterosacral ligaments, peritoneum overlying the bladder, sigmoid colon, back of the uterus, intestinal coils and appendix.It can also be seen in umbilicus following operation* in laparotomy scars, in tubal stumps following sterilization.