This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment and health, Subject name: Social & Preventive Medicine
[{'content': 'Sandfly transmits- \nSelect and explain. \nA. Kala azar, B. Oriental sore, C. Relapsing fever, D. Oraya fever', 'role': 'user'}, {'content': "Answer: A \nExplanation: In India, Kala-azar is transmitted from person to person by the bite of the female phlebotomine sandfly, P.argentipus which is a highly anthropophilic species. Transmission may also take place by contamination of the bite wound or by contact when the insect is crushed during the act of feeding Park's Textbook of Preventive and Social Medicine, 25th edition, Page No. 835", 'role': 'assistant'}]