A) P can be any of the common cold, aspergillosis or typhoid.
B) R can be any of the chikungunya, bubonic plague or malaria.
C) Q can be any of the tuberculosis pneumonia or polio.
D) S can be any of the AIDS, polio or measles.
Correct Answer: D
Solution :
Variable S represents a disease that is neither caused by a bacterium nor is spread by a vector. It can be any disease caused by other pathogenic microbes like virus, protozoan, etc. Polio, AIDS and measles all are viral diseases and are not spread by vectors.
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