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: Radiology
[{'content': 'Dose of radiation during whole body exposure that leads to haematological syndrome is: \nSelect and explain. \nA. 2 Gy, B. 10 Gy, C. 100 Gy, D. 200 Gy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. 2 Gy Total (whole) body irradiation dose > 1 to 2.5 Gy predominatly leads to hematopoietic syndromeQ; dose 5 to 8 Gy predominantly leads to gastrointestinal syndromeQ and doses 20 to 50Gy predominantly leads to cardiovascular syndromeQ.', 'role': 'assistant'}]