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: ENT
[{'content': "Which of the following arises from pheryngeal bursa- \nSelect and explain. \nA. Thornwald's disease, B. Craniopharyngioma, C. Chordoma, D. Lymphoma", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans: A. Thornwald's disease(Ref: Scott-Brown's otolaryngologlt Vh/e vol-2 p. 161, 2122; Dhingra Sh/e p. 260]Thornwald's disease (Pharyngeal bursitis):Infection of the pharyngeal bursa which is a median recess representing attachment of notochord to endoderm of the primitive pharynx.Pharyngeal bursa is located in the midline of posterior wall of the nasopharynx in the adenoid mass.Asymptomatic lesions require no treatment.If treatment is required then de-roofing the cyst (marsupialization) is usually sufficient, and can be performed a transpalatal approach.", 'role': 'assistant'}]