This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diagnostic and operative ENT, Subject name: ENT
In direct laryngoscopy which of the following cannot be visualized 
Select and explain. 
A. Cricothyroid, B. Lingual surface of epiglottis, C. Arytenoids, D. Pyriform fossa
A: Cricothyroid
Answer: A: Cricothyroid 
Explanation: Following structures are examined serially: Base of tongue, right and left valleculae, epiglottis, (its tip, lingual and laryngeal surfaces), right and left pyriform sinuses,aryepiglottic folds, arytenoids, postcricoid region, both false cords, anterior and posterior commissure, right and left ventricles, right and left vocal cords and subglottic area. Mobility of vocal cords should also be observed. Ref: Dhingra 7e pg 481.