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': 'Submucosa is absent in which part of hard palate? \nSelect and explain. \nA. Lateral and medial portion of hard palate, B. Only medial portion of hard palate, C. Anterior part of the lateral portion of hard palate, D. Posterior part of the lateral portion of hard palate', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Submucosa is absent in the medial portion of the\xa0hard palate; thus the tissue has a firmer feeling when\xa0palpated. This firm feeling is enhanced as a result of\xa0the firmness with which the lamina propria is attached\xa0to the underlying bone; thus the lamina propria serves\xa0as a mucoperiosteum. The landmarks on the hard\xa0palate, the palatal rugae and the median palatal raphe,\xa0have histological features similar to those of the medial\xa0portion of the hard palate.', 'role': 'assistant'}]