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
Commonly involved Lymph nodes during metastasis from carcinomas of oral cavity is 
Select and explain. 
A. jugulo omohyoid and jugulo digastric, B. Sub mandibular and cervical lymph nodes, C. Submental and submandibular lymphnodes, D. none of the above
B: Sub mandibular and cervical lymph nodes
Answer: B: Sub mandibular and cervical lymph nodes 
Explanation: None