Amino acids containing heterocyclic ring are (i) Histidine (ii) Valine (iii) Arginine (iv) Proline

• Correct answer
  A

  (i), (iv)
• B

  (ii), (iii)
• C

  (i), (iii)
• D

  (ii), (iv)

Solution

Histidine and proline contain heterocyclic ring.

Hence, the correct answer is option: 'A'.