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': 'External laryngocele is a herniation that arises from which of the following membrane? \nSelect and explain. \nA. Thyrohyoid membrane, B. Cricoepiglottic membrane, C. Thyroid membrane, D. Cricovocal membrane', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A laryngocele is an air filled herniation of the saccule of the laryngeal ventricle. It is caused by a prolonged increase in intraglottic pressure in patients with a predisposing long sacculus. Laryngoceles are of two types internal and external. Internal laryngocele: are confined within the larynx and appear as cystic swellings of the aryepiglottic fold. External laryngocele: extend through the thyrohyoid membrane and lie lateral to the thyroid cailage.', 'role': 'assistant'}]