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
Which of the following organ is highly susceptible to radiation induced cancer? 
Select and explain. 
A. Bone marrow, B. Thyroid, C. Bone, D. Brain
A: Bone marrow
Answer: A: Bone marrow 
Explanation: None