In the given pentapeptide, find out an essential amino acid (Y) and the sequence present in the pentapeptide:

Choose the correct answer from the options given below: [2026]
| (Y) | (Sequence) |
| Threonine | Thr–Ser–Asp–Gly–Ala |
| (Y) | (Sequence) |
| Serine | Ser–Asp–Thr–Ala–Gly |
| (Y) | (Sequence) |
| Serine | Thr–Ser–Asp–Ala–Gly |
| (Y) | (Sequence) |
| Threonine | Ser–Thr–Asp–Gly–Ala |
(1)
