Assertion (A). Monkey acts as a reservoir host for the parasite that causes African sleeping sickness
Reason (R ). Reservoir host lodges the infective stages of the parasite when primary host is not available
A. A and R are true and R is the correct explanation of A
B. A and R are true and R is the correct explanation of A
C. A is true but R is false
D. A is false but R is true.