This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cranial Nerves, Subject name: Anatomy
Injury to which of the following nerves leads to paralysis of the posterior belly of the digastric muscle? 
Select and explain. 
A. Accessory nerve, B. Trigeminal nerve, C. Ansa cervicalis, D. Facial nerve
D: Facial nerve
Answer: D: Facial nerve 
Explanation: The posterior belly of digastric is innervated by the Facial nerve, whereas the anterior belly is innervated by the mandibular division of Trigeminal nerve. The Accessory nerve supplies the sternocleidomastoid and trapezius muscles. The Ansa cervicalis innervates the infrahyoid (or strap) muscles.