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': 'Laryngocele arises as herniation of laryngeal mucosa through the following membrane: \nSelect and explain. \nA. Thyrohyoid, B. Cricothyroid, C. Cricotracheal, D. Crisosternal', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Laryngocele is an air-filled cystic swelling which occurs due to dilatation of saccule. Saccule is a diveiculum arising from anterior pa of ventricle/sinus of larynx. External laryngocele is one in which distended saccule herniates through the thyrohyoid membrane and presents as a reducible swelling in the neck, which increases in size on coughing or performing Valsalva.', 'role': 'assistant'}]