Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative _x005F_x000D_ Assertion (A) :  The Indian Constitution came into force with effect from 26th January. 1950. _x005F_x000D_ Reason (R)   :  26th January is celebrated as the Republic Day.

• A. Both A and R are true and R is the correct explanation of A.
• B. Both A and R are true but R is NOT the correct explanation of A.
• C. A is true but R is false.
• D. A is false but R is true.