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 among the following is a mode of primary prevention? \nSelect and explain. \nA. Pap smear collection, B. Marriage counselling, C. Breast examination, D. Rehabilitation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Since marriage counselling is a form of health education it is a mode of primary prevention. Both pap smear collection and breast examination is a mode of secondary prevention as the disease has already occurred and rehabilitation is a teiary mode of prevention. Ref: Park, Edition - 21, Page - 39', 'role': 'assistant'}]