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 spread by – 
Select and explain. 
A. House–fly, B. Black–fly, C. Sand–fly, D. Tsetse–fly
C: Sand–fly
Answer: C: Sand–fly 
Explanation: None