Given below are two statements. One is labelled as Assertion (A) and the other is labelled as reason (R). 
Assertion (A) : Collenchyma is a living mechanical tissue.
Reason (R) : Sclerenchyma has lignin in its cell wall.
In the light of the given statements, choose the correct answer from the options given. 

Assertion (A) is true. Collenchyma is a type of simple permanent tissue in plants that provides mechanical support to growing organs, such as stems and petioles. Collenchyma cells are elongated and have unevenly thickened primary cell walls that provide support to the plant without restricting growth. Unlike sclerenchyma, which is a dead tissue at maturity, collenchyma is a living tissue that can undergo some degree of elongation and differentiation.

Reason (R) is also true. Sclerenchyma cells have thick, lignified cell walls which provide mechanical support and rigidity to plant organs. The lignified cell walls of sclerenchyma cells make them strong and durable, allowing them to provide long-lasting structural support to plant organs such as stems and branches. 

Hence, Both A and R are correct, but R does not explain A.