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: ENT
Carcinoma of buccal mucosa commonly drain to the following lymph nodes sites - 
Select and explain. 
A. Submental, B. Submandibular, C. Supraclavicular, D. Cervical
B: Submandibular
Answer: B: Submandibular 
Explanation: Nodal involvement occurs in 50% cases of tumors of buccal mucosa.
Most common lymph node involved : Submandibular lymph nodes.