This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cytotoxic Anticancer Drugs, Subject name: Pharmacology
Vinca alkaloids act on which phase of cell cycle? 
Select and explain. 
A. G1 phase, B. S phase, C. G2 phase, D. M phase
D: M phase
Answer: D: M phase 
Explanation: S phase specific drugs:- Antimetabolite - antifolate, purine, pyrimidine analogues M phase specific drugs:- Vinca alkaloids Taxanes Anti microtubule inhibitors