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
The breeding ground for the vectors of Japanese 
Select and explain. 
A. Paddy field, B. Mixed garbage, C. Cooler water, D. Stale food
A: Paddy field
Answer: A: Paddy field 
Explanation: None