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
A patient complains of numbness of lower lip. There is no history of tooth extraction . It could be: 
Select and explain. 
A. Infection, B. Metastatic neoplasia., C. Dental menipulation., D. CNS disease.
B: Metastatic neoplasia.
Answer: B: Metastatic neoplasia. 
Explanation: None