Consider the following statements and select the correct answer from the codes given below: Assertion [A]: First war of independence broke out in India in 1857, soon after the departure of Lord Dalhousie from India. Reason [R]: Lord Dalhousie's annexationist policy had caused great discontent.

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