Assertion (A) The leaves of cauliflower become flaccid and gray in molybdenum deficiency. 

Reason (R) Cauliflower plant is affected by whiptail disease in molybdenum deficiency. 

(a) Both A and R are true and R is correct explanation of A 

(b) Both A and R are true and R is not correct explanation of A 

(c) A is true but R is false 

(d) A is false but R is true