Assertion (A) The mechanism of muscle contraction can be explained by sliding-filament theory.
Reason (R): Muscular contraction occurs by the sliding of thick filaments over the thin filaments.
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. Both (A) and (R) are false