<prompt> All are true regarding endometriosis, exceptHormone dependent conditionCan involve lung, pleuraContains clear fluidOvary is the most common site  <response>: Ans. is c, i.e. Contains clear fluidRef: Shaw 15thed, p466 for option a, 466-7for option c; Jeffcoate 7thed, p370 for option d; p372 for option bEndometriosis is occurrence of functioning endometrial tissue glands stroma outside the uterine cavity.Whatever the initial genesis of endometriosis its further development depends mainly on estrogen Option a. - Ref: Shaw 14thed, p420 It can occur anywhere in body, Most common site being ovaryQ Option d. - Ref: Jeffcoate 7thed, p370 Can also involve lungs and pleuraQ Option b. - Ref: Jeffcoate 7thed, p372 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. 