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
Incubation period of which disease is less than 7 days 
Select and explain. 
A. Leishmaniasis, B. Measles, C. Cholera, D. Mumps
C: Cholera
Answer: C: Cholera 
Explanation: None