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': 'The purpose of screening test- \nSelect and explain. \nA. To diagnose the cases, B. To so out persons who are at increased risk, C. To segregate diseased and non diseased persons, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: .<p>four main uses of screening inc ludes case detection ,control of disease,reserch purposes,educational oppounities.screening also helps in the soing out of people who are at a higher risk.</p><p>ref:park&;s textbook of preventive and social medicine,22 nd edition,pg no128</p>', 'role': 'assistant'}]