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
Thudichum speculum is used for visualizing 
Select and explain. 
A. Posterior nasal cavity, B. Posterior nares, C. Larynx, D. Anterior nasal cavity
C: Larynx
Answer: C: Larynx 
Explanation: Thudichum speculum or vienna type speculum is used to visualize anterior nasal cavity (examination is called anterior rhinoscopy). Posterior nares can be visualized during posterior rhinoscopy using posterior nasal mirror.