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': 'Incubation period of which disease is less than 7 days \nSelect and explain. \nA. Leishmaniasis, B. Measles, C. Cholera, D. Mumps', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]