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
Example of multiphasic screening is 
Select and explain. 
A. Chest X-ray for TB on large population, B. Annual health check up, C. Pap smear in old females, D. Mammography in all young females
B: Annual health check up
Answer: B: Annual health check up 
Explanation: Multiphasic screening: It is the application of two or more screening tests to a large population at one time instead of carrying out separate screening tests for single diseases.Randomised control studies suggested that multiphasic screening has not shown any benefit accruing to the population in terms of moality and morbidity reduction.