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Given below are two statements. One is labelled Assertion (A) and the other is labelled Reason (R). 
Assertion (A) : Reabsorption of water in PCT is obligatory, while in DCT, it is conditional.
Reason (R) : Reabsorption of water takes place passively in the initial segments of the nephron, while the distal segments reabsorb only in the presence of vasopressin.
In the light of the above statements, choose the most appropriate answer from the options given below. 

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Both (A) and (R) are true and (R) is the correct explanation of (A).

Both (A) and (R) are true but (R) is not the correct explanation of (A).

(A) is true but (R) is false.

Both (A) and (R) are false.

answer is A.

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Detailed Solution

Both (A) and (R) are true and (R) is the correct explanation of (A).

Water reabsorption is obligatory in the proximal convoluted tubule (PCT) due to its high permeability and osmosis created by the solutes, while in the distal convoluted tubule (DCT), it's conditional, regulated by hormones like vasopressin/ADH.

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