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: Surgery
Most common site of metastasis of Medullary carcinoma of thyroid: 
Select and explain. 
A. Liver, B. Lung, C. Kidney, D. Brain
A: Liver
Answer: A: Liver 
Explanation: Sites of spread of medullary thyroid carcinoma include local lymph nodes in the neck, lymph nodes in the central portion of the chest (mediastinum), liver, lung, and bone.
 Spread to other sites such as skin or brain occurs but is uncommon.
 Most common site of metastasis of Medullary carcinoma of thyroid is liver.