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': "True about OPT' ail except: \nSelect and explain. \nA. We get quick immune response, B. It is a live vaccine, C. It is used in epidemic, D. Maternal antibody interferes with immune response", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a. Disease in very fatal and /or easily curable Prevalence (P): Incidence (I) x Duration (D) Q Incidence reflects causal factorsdeg Duration reflects the prognostic factorsdeg If the prevalence is very low, then either incidence is low or duration is shodeg . Duration is sho if the disease is easily curable or very fatal', 'role': 'assistant'}]