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
Rat is involved in: 
Select and explain. 
A. Measles, B. Tetanus, C. Mumps, D. Leptospirosis
D: Leptospirosis
Answer: D: Leptospirosis 
Explanation: Leptospirosis