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
[{'content': 'Which of the following anticancer drugs can cross blood brain barrier ? \nSelect and explain. \nA. Cisplatin, B. Nitrosourea, C. Vincristine, D. Vinblastine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]