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 of the following disease has an incubation period of less than 1 week: March 2010 \nSelect and explain. \nA. Measles, B. Cholera, C. Mumps, D. Peussis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B: Cholera Measles- 10 days from the onset of fever and 14 days to appearance of rash. Cholera: few hours upto 5 days, but commonly 1-2 days Mumps: 2-3 weeks (usually 18 days) Peussis: usually 7-14 days, but not more than 3 weeks', 'role': 'assistant'}]