This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment and health, Subject name: Social & Preventive Medicine
[{'content': 'What is used to prevent exposure in operation theatre- \nSelect and explain. \nA. Wooden paition, B. Lead gown, C. Nickle gown, D. Iron gown', 'role': 'user'}, {'content': "Answer: B \nExplanation: Park's textbook of preventive and social medicine 23rd edition. * Effective protective measures include proper use of lead shields and lead rubber aprons.", 'role': 'assistant'}]