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 diseases have incubation period <10 days - 
Select and explain. 
A. Cholera, B. Influenza, C. Plague, D. All
D: All
Answer: D: All 
Explanation: Ans. is 'a' i.e., Cholera; 'b' i.e., Influenza & 'c' i.e., Plague