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
An old man presented with hoarseness, cough, dysphagia, and foreign body sensation in the throat. Laryngocele was suspected. Laryngocele arises from herniation through: 
Select and explain. 
A. Cricothyroid membrane, B. Thyrohyoid membrane, C. Laryngeal fold, D. None of the above
B: Thyrohyoid membrane
Answer: B: Thyrohyoid membrane 
Explanation: A laryngocele is defined as an abnormal dilation or herniation of the saccule of the larynx. Laryngoceles can be classified into three types: internal, external, and combined. A laryngocele is defined as internal if the dilation lies within the limits of the thyroid cailage. If the laryngocele extends beyond the thyroid cailage and protrudes through the thyrohyoid membrane producing a lateral neck mass, it is considered external.