Which of the following is an essential amino acid?

  • A
    $CH_3-CH(NH_2)-COOH$ (Alanine)
  • B
    $HOCH_2-CH(NH_2)-COOH$ (Serine)
  • C
    $(CH_3)_2CH-CH_2-CH(NH_2)-COOH$ (Leucine)
  • D
    $HSCH_2-CH(NH_2)-COOH$ (Cysteine)

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