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
Threshold radiation dose for hematological syndrome is? 
Select and explain. 
A. 2 Gy, B. 6 Gy, C. 15 Gy, D. 50 Gy
A: 2 Gy
Answer: A: 2 Gy 
Explanation: Ans. is'a'i.e., 2 GyBone marrow or hematological syndrome:- Full syndrome occurs with a dose between 0.7 and 3 Gy (70-300 rads).The destruction of bone marrow cells results in pancytopenia.