The amino acid from which niacin is synthesized is---------

Options :
  1. Tyrosine
  2. Tryptophan
  3. Histidine
  4. Threonine
Answer and Explanation :-

Answer: Option 2

Explanation:

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I am not a 'wise man,' nor . . . shall I ever be. And so require not from me that I should be equal to the best, but that I should be better than the wicked. It is enough for me if every day I reduce the number of my vices, and blame my mistakes.
-Seneca