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': 'Unit of one of radiation absorbed is - \nSelect and explain. \nA. Grey, B. Roengten, C. Curie, D. Bequerrel', 'role': 'user'}, {'content': "Answer: A \nExplanation: Park's textbook of preventive and social medicine 23rd edition. * Gray(Gy) is the unit of absorbed dose, defined as the dose of ionizing that impa 1 Joule of energy to 1kg of absorbing material.", 'role': 'assistant'}]