This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
Which of the following is not a mixed nerve? 
Select and explain. 
A. Vagus, B. Glossopheryngeal, C. Facial, D. Trochlear
D: Trochlear
Answer: D: Trochlear 
Explanation: Trochlear nerve is the fouh cranial nerve, it supplies the superior oblique muscle of the eyeball. Functional components: - General somatic efferent, for lateral movement of the eyeball. - The general somatic afferent, for proprioceptive impulses from the muscle to the mesencephalic nucleus of V nerve. Ref: BD Chaurasia's HUMAN ANATOMY, Volume 3.