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
Maximum radiation dose tolerable tissue is- 
Select and explain. 
A. Hemopoietic tissue, B. Testis, C. Ovary, D. Bone
D: Bone
Answer: D: Bone 
Explanation: A bone is a rigid organ that constitutes part of the vertebrate skeleton.
Bones support and protect the various organs of the body, produce red and white blood cells, store minerals, provide structure and support for the body,
and enable mobility.