[A]: When platelets disintegrate, 5-hydroxy tryptamine and histamine are liberated.
[R]: Speed of clot reaction is directly propor- tional to the number of platelets present.
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