**Core Concept**
The question is testing the student's knowledge of antineoplastic drugs, specifically their classification based on chemical structure. Peptide-based antineoplastic drugs are a class of agents that mimic or modify the immune system's response to cancer cells.

**Why the Correct Answer is Right**
The correct answer is a peptide-based antineoplastic drug that works by binding to specific receptors on cancer cells, triggering an immune response that leads to cell death. This class of drugs includes molecules that are composed of short chains of amino acids, which are the building blocks of proteins. The peptide structure allows these drugs to interact with specific receptors on the surface of cancer cells, activating a cascade of events that ultimately leads to cell death. Examples of peptide-based antineoplastic drugs include interleukin-2 (IL-2) and interferon-alpha (IFN-α).

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify a peptide-based antineoplastic drug. While some antineoplastic drugs may be based on amino acids or proteins, they may not be peptides in the classical sense.
**Option B:** This option is incorrect because it refers to a different class of antineoplastic drugs, such as alkylating agents or topoisomerase inhibitors, which do not have a peptide structure.
**Option C:** This option is incorrect because it is a type of antineoplastic drug that is not based on peptides. Instead, it is a small molecule that targets specific enzymes or receptors involved in cancer cell growth and survival.

**Clinical Pearl / High-Yield Fact**
Peptide-based antineoplastic drugs can have a broad range of mechanisms of action, including direct cytotoxic effects, induction of apoptosis, and activation of immune responses. These drugs can be particularly effective against certain types of cancer, such as melanoma and renal cell carcinoma.

**Correct Answer:** C.