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': 'Pterygomaxillary seal is: \nSelect and explain. \nA. Part of the PPS that extends across the hamular notch., B. It extends 3-4 mm anterolaterally., C. Both 1 and 2., D. It extends between the two maxillary tuberosities.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: PPS area can be divided into 2 regions:\n\nPterygomaxillary seal is the part of the PPS, that extends across the hamular notch and it extends\xa03-4mm anterolaterally to end in the mucogingival junction on the posterior part of the maxillary\xa0ridge.\nPosterior palatal seal is the part of the PPS, that extends between the two maxillary tuberosities.', 'role': 'assistant'}]