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: Medicine
Carcinomas of all of following sites metastasize to vertebral column except - 
Select and explain. 
A. Breast, B. Bronchus, C. Prostate, D. Esophagus
D: Esophagus
Answer: D: Esophagus 
Explanation: None