This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
[{'content': 'A person is on intensive chemotherapy; which vaccine is contraindicated in this circumstance? \nSelect and explain. \nA. MMR, B. Hepatitis B, C. Pneumococcus, D. DPT', 'role': 'user'}, {'content': "Answer: A \nExplanation: Park's textbook of preventive and social medicine 23 edition. *Measles and MMR should not be administered on those on treatment with high dose steroids, alkylating agents or anti metabolites or under immunosuppressive therapeutic radiation.", 'role': 'assistant'}]