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(A) N(2)O is called laughing gas (R ) ...

(A) `N_(2)O` is called laughing gas
(R ) `N_(2)O` causes hysterical laugh.

A

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

B

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

C

(A) is true but (R ) is false

D

Both (A) and (R ) are false

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