Assertion and Reason

Assertion(A): Carbon monoxide inhaled causes death.
Reason(R): Carbon monoxide combines with haemoglobin.

(a) Both A & R are true and R is the correct explanation of A.
(b) Both A & 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 false

(a) Both A & R are true and R is the correct explanation of A.