Q.

(A) : Lactose is a reducing sugar.
(R) : Lactose contains glucose and galactose units. 
 

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a

(A) is false and (R) is true 
 

b

Both (A) and (R) are correct. (R) does not exaplain (A) 
 

c

Both (A) and (R) are correct. (R) properly exaplains (A) 
 

d

(A) is true and (R) is false 
 

answer is B.

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Detailed Solution

Lactose is reducing sugar due to its free hemi acetal  linkage . 

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(A) : Lactose is a reducing sugar.(R) : Lactose contains glucose and galactose units.