Source of infection in diseases like Tuberculosis, Mumps and Whooping cough is

A. Direct contact

B. Droplets of saliva

C. Carrier organism

D. A vector

Answer: Option B

Solution(By Examveda Team)

Tuberculosis, mumps and whooping cough are the contagious types of diseases. The diseases can spread through the droplets or the aerosols which are formed during coughing or sneezing. These aerosols contain the bacterium. The bacterium may enter the other person's body who is healthy and cause infection.

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C. decrease in thickness of ozone layer in stratosphere

D. increase in the thickness of ozone layer in troposphere