This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
All are true regarding endometriosis, except : 
Select and explain. 
A. Hormone dependent condition, B. Can involve lung. pleura, C. Contains clear fluid, D. Ovary is the most common site
C: Contains clear fluid
Answer: C: Contains clear fluid 
Explanation: Ans. is c i.e. Contains clear fluid As already explained in previous question, endometriosis is occurence of functioning endometrial tissue (glands + stroma) outside the uterine cavity. Whatever the inital genesis of endometriosis its fuher development depends mainly on estrogen (Option "a) It can occur anywhere in body, Most common site being ovarydeg (Option "d"). Can also involve lungs and pleuradeg (Option "b"). - In endometriosis ovary contains tarry dark brown fluid (due to presence of blood pigments like hemosiderin) and cul de sac has yellow brown fluid. Clear fluid is not seen anywhere. So, Option "c" is incorrect. For more details about endometriosis, see answer 1