This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Osteology, Subject name: Anatomy
Osteoclasts are 
Select and explain. 
A. Derived from hematopoietic cells, B. Multi nucleated cells, C. Develop in inactive stage, D. All are true
D: All are true
Answer: D: All are true 
Explanation: Osteoclasts are responsible for bone resorption. They are multi-nucleated cells These cells are derived from the mononuclear hematopoietic progenitor cells