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: Pathology
[{'content': 'A patient complains of frequent dislocation of the temporomandibular joint and frequent bleeding from gums, on examination, it was noticed that gingival tissue is very fragile, what should be the diagnosis: \nSelect and explain. \nA. Lichen planus., B. Pemphigus., C. SLE, D. Ehlers-Danlos syndrome.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The oral mucosa was of normal color but was\xa0excessively fragile and bruised easily. Although the mucosa\xa0did not hold sutures satisfactorily, healing was only slightly\xa0retarded and there was no defective scar formation. No\xa0remarkable hyperextensibility of mucous membrane could be\xa0demonstrated, and the patients had no difficulty in wearing\xa0dentures. The gingival tissues appeared fragile and bled after\xa0tooth brushing, gingival hyperplasia and fibrous nodules were\xa0also noted. Tooth mobility was not increased.\xa0Hypermobility of the temporomandibular joint, resulting in\xa0repeated dislocations of the jaw, has been reported.', 'role': 'assistant'}]