Thyroxine and catecholamines are derived from --------

Options :
  1. Alanine
  2. Tryptophan
  3. Tyrosine
  4. Leucine
Answer and Explanation :-

Answer: Option 3


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That's the duty of the old, to be anxious on behalf of the young. And the duty of the young is to scorn the anxiety of the old.
-Philip Pullman The Golden Compass