[A] : Prostaglandins are hormone like mol- ecules produced by many body cells of mam- mals
[R]: Prostaglandins stimulates contraction of smooth muscles, secretion and piatelet ag- gregation.
A. If both A and R are true and R is the correct explanation of A
B. If both A and R are true but R is not the correct explanation of A
C. If A is true and R is false
D. If both A and R are false