This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neck Triangles and parotid gland, Subject name: Anatomy
Following a penetrated injury in the submandibular triangle, the tongue of 45 year old patient detes to the left on protrusion. Which of the following nerves is injured? 
Select and explain. 
A. Right lingual nerve, B. Left lingual nerve, C. Right hypoglossal nerve, D. Left hypoglossal nerve
D: Left hypoglossal nerve
Answer: D: Left hypoglossal nerve 
Explanation: A lesion of the hypoglossal nerve causes detion of the tongue toward the injured side on protrusion. The lingual and glossopharyngeal nerves do not supply the tongue muscles. Hence option 4 i.e. left hypoglossal nerve (same as the side of detion) is correct.