This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
[{'content': 'Retropharyngeal space extends from the base of the skull to \nSelect and explain. \nA. Hyoid bone, B. Bifurcation of trachea, C. Angle of mandible, D. Cricoid cailage', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Retropharyngeal space: It lies behind the pharynx between the buccopharyngeal fascia covering pharyngeal constrictor muscles and the preveebral fascia.It extends from the base of the skull to the bifurcation of the trachea.Space is divided into two lateral compaments (spaces of Gillette) by a fibrous raphe.Each lateral space contains retropharyngeal nodes which usually disappear at3-4 years of age.Parapharyngeal space communicates with the retropharyngeal space.Infection of retropharyngeal space can pass down behind the esophagus into the mediastinum.', 'role': 'assistant'}]