Structure which remains unchanged, during metamorphosis of frog's tadpole is

Lung

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Heart

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Brain

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Intestine

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Solution

The correct option is C Brain
The nervous system undergoes least changes during metamorphosis of frog's tadpole. Frog's nervous system once differentiated remains as such throughout life. However, the brain acquires its normal shape and size.
Therefore, the correct answer is option C.

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