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
In a direct laryngoscopy,which of the following can be visualized? 
Select and explain. 
A. Cricothyroid, B. Lingual surface of epiglottis, C. Arytenoids, D. All
D: All
Answer: D: All 
Explanation: Larynx: Epiglottis, aryepiglottic folds, arytenoids, cuneiform and corniculate cailage, ventricular ands, ventricles, true cords, anterior commissure, posterior commissure, subglottis and rings of trachea. Hypopharynx: Both pyriform fossae, post-cricoid region, posterior wall of laryngopharynx. Oropharynx: Base of tongue, lingual tonsils, valleculae, media and lateral glosso-epiglottic folds.