Assertion (A) : Picric acid does not contain `-COOH` groups.
Reason (R) : Picric acid is trihydric trinitrophenol.
A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true and R is not a correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.