Understand the question

A substance is called a protein if on hydrolysis it gives amino acids. So we need to identify an amino acid that can be obtained from hydrolysis of a protein.

Key concept

Proteins are polymers of $\alpha$-amino acids. Therefore, on complete hydrolysis, they yield amino acids such as glycine, alanine, valine, etc.

Issue with the options

The options shown in the question are blank:

• A:
• B:
• C:
• D:

So the exact option contents are not visible. Hence, the amino acid must be inferred conceptually.

Inference from standard biomolecules questions

In such questions, the correct option is the structure/name of an amino acid among non-amino-acid biomolecules. Since the stored correct answer is C, option C must correspond to an amino acid.

Conclusion

Therefore, the correct answer is option C.

Since the option text is missing, the most precise statement we can make is:

• Hydrolysis of proteins gives amino acids.
• Hence the correct choice is the option representing an amino acid.