Assertion `:` Certain narcotics are used as analgesics.
Reason`:` Narcotics lower the body temperature in high fever.
A. If both the assertion and reason are true and the reason is the correct explanation of the assertion
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If assertion is false but reason is true.