This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy, Subject name: Pharmacology
[{'content': 'Which of the following anticancer drug can cross blood brain barrier? \nSelect and explain. \nA. Cisplatin, B. Nitrosourea, C. Vincristine, D. Vinblastine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Cisplati n It is a platinum coordination complex that is hydrolysed intracellularly to produce a highly reactive moiety which causes cross linking ofDNA. Theoured siteis N&;ofguanineresidue. It can also react with -SH groups in proteins and has radiomimetic propey. It is bound to plasma proteins, enters tissues and is slowly excreted unchanged in urine with a tlh about 72 hrs. Negligible amounts enter brain. Cisplatin is very effective in metastatic testicular and ovarian carcinoma. It has found use in many other solid tumours as well. Cisplatin is a highly emetic drug. Antiemetics are routinely administered before infusing it. The most impoant toxicity is renal impairment which is dependent on total dose administered. Renal toxicity can be reduced by maintaining good hydration. Tinnitus, deafness, neuropathy and hyperuricaemia are other problems. Shock like state sometimes occurs during i.v. infusion. ESSENTIALS OF MEDICAL PHARMACOLOGY K.D.TRIPATHI SIXTH EDITION PAGE NO:827,828', 'role': 'assistant'}]