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
You are presented with a patient having a diffuse swelling in the neck bilaterally below the chin region. Intra orally the Lower molar is infected on left side

What is the probable source of infection? 
Select and explain. 
A. Sub maxillary space infection, B. Sub mandibular space infection, C. Sub lingual space infection, D. Sub mental space infection
B: Sub mandibular space infection
Answer: B: Sub mandibular space infection 
Explanation: None