Assertion (A): Heart failure is sometimes called congestive heart failure.
Reason (R): Congestion of the lungs is one of the main symptoms of this disease.
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.