This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pharynx, Subject name: ENT
[{'content': 'Bed of tonsil is formed by \nSelect and explain. \nA. Superior constrictor, B. Middle constrictor, C. Inferior constrictor, D. Platysma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The tonsillar bed is formed by the following: Pharyngobasilar fascia Superior constrictor muscle Buccopharyngeal fascia Styloglossus muscle Glossopharyngeal nerve Ref: PL Dhingra, Diseases of Ear, Nose & Throat, 7th edition, pg no. 291', 'role': 'assistant'}]