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
Mechanism of action of vincristine in the treatment of ALL is : 
Select and explain. 
A. Inhibition of topoisomerase II to cause breaks in DNA strands, B. Alkylation and cross linking DNA strands, C. Inhibition of DNA mediated RNA synthesis, D. Inhibition of polymerization of tubulin to form microtubules
D: Inhibition of polymerization of tubulin to form microtubules
Answer: D: Inhibition of polymerization of tubulin to form microtubules 
Explanation: None