This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: miscellaneous, Subject name: Pathology
Ratio of fat cells and RBC in bone marrow 
Select and explain. 
A. 4:01, B. 1:01, C. 1:02, D. 2:01
A: 4:01
Answer: A: 4:01 
Explanation: Bone marrow contains two types of stemcells: hemopoietic (which can produce blood cells) and stromal (which can produce fat, cailage and bone). ... Red blood cells, platelets and most white blood cells arise in red marrow; some white blood cells develop in yellow marrow