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': 'Communicability is best measured by \nSelect and explain. \nA. Serial Interval, B. Secondary attack rate, C. Case fatality rate, D. Generation time', 'role': 'user'}, {'content': 'Answer: B \nExplanation: SAR is defined as the number of exposed persons developing the disease within the range of the incubation period, following exposure to the primary case.\xa0Hence it shows the communicability.', 'role': 'assistant'}]