This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Which anticancer drug prevents spindle formation is - 
Select and explain. 
A. Busulfan, B. Vinca alkaloids, C. 5 - FU, D. Methotrexate
B: Vinca alkaloids
Answer: B: Vinca alkaloids 
Explanation: Ans. is 'b' i.e., Vinca alkaloids