Assertion (A): RBCs contain a red-colored complex protein called hemoglobin.
Reason (R): RBCs are devoid of nucleus in most of the mammals and are biconcave in shape.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.