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
Most common cause of Vertebra plana 
Select and explain. 
A. Eosinophilic granuloma, B. Leukemia, C. TB, D. Metastasis
A: Eosinophilic granuloma
Answer: A: Eosinophilic granuloma 
Explanation: Vertebra plana:

Uniform collapse of a vertebral body into a thin, flat disc.
M/c cause - Eosinophilic granuloma.