A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
E) If the assertion is false but reason is true
Correct Answer: C
Solution :
In blood of man, microfilariae show day and night periodicity, called diurnal rhythm. By day, they live in large deep seated blood vessels, but at night and during sleep, they come into superficial or peripheral vessels in the skin, to be sucked by nocturnal mosquitoes (Culex or Aedes) which serve intermediate host. In places, where are diurnal mosquitoes, they reverse this periodicity. Microfilariae in human blood eventually die when ingested by the intermediate host sucking blood from infected human.
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