Thudichum speculum is used for visualizing: (A) Posterior nasal cavity, (B) Posterior nares, (C) Larynx, (D) Anterior nasal cavity
Answer is C. 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.