A) day time
B) night time
C) morning
D) evening
Correct Answer: B
Solution :
The microfilaria found in peripheral blood but appear periodically at night mostly between 10.00 PM and 4.00 AM, thus showing a nocturnal periodicity. The mechanism of this nocturnal periodicity is not yet clearly known but it is presumed to be in some way related with the night feeding habit of its inter mediate host, Culex pipiens fatigans.
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