All are true regarding endometriosis, except:: (A) Hormone dependent condition, (B) Can involve lung, pleura, (C) Contains clear fluid, (D) Ovary is the most common site
Answer is C. Whatever the inital genesis of endometriosis its further development depends mainly on estrogen (Option “a”).
 It can occur anywhere in body, Most common site being ovary(Option “d”). 
 Can also involve lungs and pleura (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.