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
Kala-azar is transmitted by ? 
Select and explain. 
A. Reduvid bug, B. Sandfly, C. Tsetse fly, D. Mosquito
B: Sandfly
Answer: B: Sandfly 
Explanation: Ans. is 'b' i.e., Sandfly