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
Sensory supply to tonsil is by which nerve? 
Select and explain. 
A. Greater palatine nerve, B. Lesser palatine nerve, C. Vagus, D. Glossopharyngeal nerve
D: Glossopharyngeal nerve
Answer: D: Glossopharyngeal nerve 
Explanation: Ninth nerve (glossopharyngeal) is the nerve of third branchial arch. It carries sensory fibres from the posterior one-third of tongue, tonsil, pharynx, middle, ear, taste fibres from posterior one-third of tongue and circumvallate papillae. Ref: BD Chaurasia's HUMAN ANATOMY, Volume 3, 4th edition.