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': 'Primary prevention-a) Marriage counselingb) Early diagnosis and treatmentc) Pap smeard) Self breast examinatione) Immunization \nSelect and explain. \nA. da, B. ae, C. dea, D. ac', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Immunization and marriage counseling (a type of health education) are primary level of prevention.\nPap smear is a screening test for cervical cancer and self breast examination is a screening test for breast lump both are secondary level of prevention.\nEarly diagnosis and treatment is a secondary level of prevention.', 'role': 'assistant'}]