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
Which of the following disease has an incubation period of less than 1 week: March 2010 
Select and explain. 
A. Measles, B. Cholera, C. Mumps, D. Peussis
B: Cholera
Answer: B: Cholera 
Explanation: 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