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Question

Cretinism is caused due to ........... of thyroxin. (undersecretion/ oversecretion)

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Solution

Cretinism is the retarded mental and physical development which is associated with the hyposecretion (i.e. low secretion) of thyroid hormones. The hormones are passed from the mother to the child, so the child appears normal at first, but retarded mental and physical development becomes evident in the following few weeks or months.
Hence, Cretinism is caused due to undersecretion of thyroid hormone thyroxin.
So, the correct answer is 'undersecretion'.

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