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
While performing a submandibular sialography the cannula is inserted in the following direction to prevent damage to Wharton's duct. 
Select and explain. 
A. Upward and medial, B. Medial to lateral, C. Lateral to medial, D. Lateral and downward
B: Medial to lateral
Answer: B: Medial to lateral 
Explanation: None