Correct answer: (2) Vincristine

Explanation:

• Vincristine is a well-known anti-cancer drug derived from the plant Catharanthus roseus, also called Madagascar periwinkle. It belongs to the class of vinca alkaloids used in chemotherapy to treat various cancers by inhibiting microtubule formation and cell division.

• (1) Taxol is an anti-cancer compound from Taxus species (yew tree), not from Catharanthus.

• (3) Colchicine comes from Colchicum species and is used mostly for gout treatment, not as a primary anti-cancer agent like vincristine.

• (4) Serpentine (more commonly called reserpine) is an alkaloid from Rauwolfia serpentina and is used for hypertension and mental disorders, not cancer treatment.

Option-wise:

• (1) Taxol — Incorrect.

• (2) Vincristine — Correct.

• (3) Colchicine — Incorrect.

• (4) Serpentine — Incorrect.

  Vincristine, derived from Catharanthus roseus, is an essential chemotherapeutic agent that disrupts microtubule assembly to inhibit cancer cell growth, distinguishing it from other plant-derived drugs like taxol, colchicine, and serpentine.