This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endometriosis, Subject name: Gynaecology & Obstetrics
The organ NOT involved by endometriosis: 
Select and explain. 
A. Liver, B. Lymph nodes, C. Brain, D. Spleen
D: Spleen
Answer: D: Spleen 
Explanation: Ans. is d, i.e. SpleenRef: Williams Gynecology, 3/ed, p23One pathological review revealed that endometriosis has been identified in all organs except spleen.