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: Pathology
Metastases from carcinoma of tongue by blood stream is more likely when the carcinoma involves the 
Select and explain. 
A. anterior third, B. middle third, C. posterior third, D. lateral margin
C: posterior third
Answer: C: posterior third 
Explanation: None