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# Given the Assertion and Reason below, Choose one of the following responses :

Assertion: Auxin and chytokinin are required in correct concentration for the development of root and shoot in callus.

Reason: When the concentration of kinetin to auxin is high the shoot develops,and when the concentration is low root develops.

(A) Both assertion and reason are true and the reason is a correct explanation of the assertion
(B) Both assertion and reason are true but reason is not a correct explanation of the assertion
(C) Assertion is true but the reason is false
(D) Both assertion and reason are false

Both assertion and reason are true and the reason is a correct explanation of the assertion
Hence (A) is the correct answer.