This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Screening, Subject name: Social & Preventive Medicine
[{'content': 'Example of Multiphase screening is: \nSelect and explain. \nA. Chest X-ray for TB large population, B. Annual health check up, C. Pap smear in old females, D. Mammography in all young female', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Multiphasic screening: application of two or more screening tests in combination to a large number of people at one time. Example: annual health check ups. Multipurpose screening: screening by more than one test done simultaneously to detect more than one disease. Example: screening of a pregnant women for VDRL, HIV, HBV serological tests on a blood sample. Mass screening: Screening test applied on large population. Eg- CXR in elderly. High risk/ selective screening: Applied on high risk groups .Eg- screening for HIV in commercial sex workers.', 'role': 'assistant'}]