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: Social & Preventive Medicine
[{'content': 'Which of the following is not useful as a screening method ? \nSelect and explain. \nA. Pap smear for cervical cancer, B. CA-125 for ovarian cancer, C. Office endometrial washing for endometrial cancer, D. USG in endometrial cancer', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., CA-125 for ovarian cancer o Endometrial cancer screening : i) Pap smear (Not much useful; only recommended for cervical cancer) ii) Ultrasonography iii) Office endometrial washings iv) Colour flow imaging o Ca-125 in not useful in screening ovarian cancers because : i) CAl25 increases only in late stages of cancer ii) CAl25 gives a lot of false positive results iii) CAl25 with USG is a good screening test", 'role': 'assistant'}]