Match the amino acid given in List-I with their one letter code given in List-II

List-I	List-II
Name of amino acid	One letter code
(A) Lysine	(I) W
(B) Tryptophan	(II) Q
(C) Tyrosine	(III) K
(D) Glutamine	(IV) Y

Choose the correct answer from the options given below:

The correct option is (A) – (III), (B) – (I), (C) – (IV), (D) – (II).

To understand why this is the correct matching, let us look at the standard rules and assignments for the single-letter codes of these amino acids:
1. Lysine (A): The one-letter code for Lysine is K (III). Since the letter 'L' is already assigned to Leucine, 'K' is designated for Lysine (as it is the closest letter in the alphabet that was not already taken).
2. Tryptophan (B): The one-letter code for Tryptophan is W (I). The code 'T' is used for Threonine, so 'W' is chosen because of the double-ring structure in tryptophan's side chain (which resembles a 'W').
3. Tyrosine (C): The one-letter code for Tyrosine is Y (IV). The letter 'Y' represents the phonetic sound in tyrosine, since 'T' is already taken.
4. Glutamine (D): The one-letter code for Glutamine is Q (II). The letter 'G' is assigned to Glycine and 'E' to Glutamic acid, so 'Q' (phonetically sounding like "Q-tamine") is used for Glutamine.

By mapping each amino acid to its respective one-letter code, we get:
• (A) Lysine → (III) K
• (B) Tryptophan → (I) W
• (C) Tyrosine → (IV) Y
• (D) Glutamine → (II) Q

Thus, the correct match is (A) – (III), (B) – (I), (C) – (IV), (D) – (II).