Identify the correct statements.$\\$ A. Arginine and Tryptophan are essential amino acids.$\\$ B. Histidine does not contain heterocyclic ring in its structure.$\\$ C. Proline is a six membered cyclic ring amino acid.$\\$ D. Glycine does not have chiral centre.$\\$ E. Cysteine has characteristic feature of side chain as $\mathrm{MeS}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-.\\$ Choose the correct answer from the options given below: