This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Integrated QBank, Subject name: Unknown
A male patient was undergoing routine health checkup and investigations when a lump was incidentally diagnosed on clinical examination. Clinician advised USG following which USG guided biopsy was done. HPE examination revealed the following diagnosis. Patient was staed on chemotherapy including a drug obtained from the given plant. What is the site of action of the drug mentioned above? 
Select and explain. 
A. B, B. C, C. D, D. A
A: B
Answer: A: B 
Explanation: Vinblastine is an alkaloid derived from the periwinkle plant Vinca rosea. It has clinical activity in the treatment of Hodgkin's and non-Hodgkin's lymphomas, breast cancer, and germ cell cancer. It inhibits mitosis that is M phase of cell cycle.