Multiple choice

Thyroxin is synthesized from

  1. iodine

  2. vitamin A

  3. vitamin B

  4. vitamin C

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A Correct answer
Explanation

 Thyroxin is synthesized from iodine.Thyroxine is the main hormone secreted into the bloodstream by the thyroid gland. It is the inactive form and most of it is converted to an active form called triiodothyronine by organs such as the liver and kidneys.

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