Match the amino acid in List I with its description in List II. List I: (P) Lysine; (Q) Aspartic acid; (R) Glycine; (S) Valine. List II: (1) acidic side chain; (2) basic side chain; (3) no stereocentre; (4) essential amino acid with a neutral side chain.

AP-2, Q-1, R-3, S-4
BP-1, Q-2, R-3, S-4
CP-2, Q-1, R-4, S-3
DP-4, Q-1, R-3, S-2

Answer: A

Lysine has a second amino group (basic), aspartic acid has a second carboxyl (acidic), glycine has no stereocentre, and valine is an essential amino acid with a neutral alkyl side chain.

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