This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
[{'content': 'All of the following canals open on the posterior\nwall of the pterygo palatine fossa EXCEPT \nSelect and explain. \nA. Greater palatine canal, B. Foramen Rotundum, C. Pterygoid canal, D. Palatovaginal canal', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Pterygopalatine Fossa:\n\nThis is a small pyramidal space situated deeply, below the apex of orbit.\n\nCommunications:\n\nAnteriorly : With orbit through inferior orbital fissure.\nPosteriorly :\n\t\nWith middle cranial fossa\xa0through foramen rotundum.\nWith foramen lacerum\xa0through pterygoid canal.\nWith pharynx\xa0through palatinovaginal canal.\n\n\nMedially : With nose\xa0through sphenopalatine foramen.\nLaterally : With infratemporal fossa through pterygomaxillary fissure.\nInferiorly : With oral cavity through greater & lesser palatine canals.', 'role': 'assistant'}]