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Assertion [A]: Thick layers of muscles are present in the wah of alimentary canal. Reason [R]: These muscles help in the mixing of food materials with the enzymes coming from different glands in the alimentary canal.                                                                                                    (AIIMS 2007)

A) If both [A] and [R] are true and [R] is the correct explanation of the [A]

B) If both [A] and [R] are true but the [R] is not the correct explanation of [A]

C) If [A] is true, but [R] is false

D) If both [A] and [R] are false