[A] : Nephritis is the inflammation of the lungs and muscles.
[R]: It is caused. by bacterial infection.

Options

A. 1)If both A and R are true and R is the correct explanation of A
B. 2)If both A and R are true but R is not the correct explanation of A
C. 3)If A is true and R is false
D. 4)If both A and R are false

Answer

D