This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
Maximum density of microfilariasis in blood is repoed to be between - 
Select and explain. 
A. 9 pm to 11 pm, B. 10 pm to 2 am, C. 8 pm to 10 pm, D. 2 am to 5 am
B: 10 pm to 2 am
Answer: B: 10 pm to 2 am 
Explanation: <p> Filariasis:- Causative agent- W.bancrofti, B.malayi and B.timori. Man is definitive host. Mosquito is the intermediate host. Infective stage- microfilaria. The maximum density of microfilaria in blood is repoed between 10 pm-2am. Treatment- DEC. Filarial control in community. {Reference: park&;s textbook of preventive and social medicine, 23rd edition, pg no.274}</p>