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: Dental
[{'content': 'Which of the following are constituents of\xa0the\xa0cranial base? \nSelect and explain. \nA. Maxilla, mandible and cranial vault, B. Ethmoid, sphenoid and occipital, C. Palatal, nasal and zygoma, D. Frontal and parietal', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The cranial base includes from anterior to posterior, the ethmoid, sphenoid, and occipital\xa0 bone.', 'role': 'assistant'}]