Assertion (A) : After the Kushans the Turks brought the technique of constructing the true, arch on a massive scale.
Reason (R): The Turks introduced into India the technique of preparing lime-mortar.
(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 the correct explanation of A
(C) A is true but R is false
(D) A is false but R is true