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
Isolation as a method of a control is infection in which of the following disease ? 
Select and explain. 
A. Diphtheria, B. Plague, C. Mumps, D. All
D: All
Answer: D: All 
Explanation: Ans. is 'a' i.e., Diphtheria; 'b' i.e., Plague; 'c' i.e., Mumps