Assertion $(A):$ In Pneumonia and common cold, close contact with an infected person should be avoided.
Reason $(R):$ Pneumonia and common cold are airborne diseases.

• A
  Both $(A)$ and $(R)$ are correct but $(R)$ is not the correct explanation of $(A)$
• B
  $(A)$ is correct but $(R)$ is not correct
• C
  Both $(A)$ and $(R)$ are incorrect
• D
  Both $(A)$ and $(R)$ are correct and $(R)$ is the correct explanation of $(A)$