This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Larynx, Subject name: ENT
A Blom-Singer prosthesis is used: 
Select and explain. 
A. As a ventilation tube in otitis media with effusion, B. To close a perforation in nasal septum, C. To divert tracheal air into oesophagus for voice production in laryngeal patients, D. In stapedectomy to conduct sound from incus to oval window
C: To divert tracheal air into oesophagus for voice production in laryngeal patients
Answer: C: To divert tracheal air into oesophagus for voice production in laryngeal patients 
Explanation: Blom-Singer prosthesis is used in laryngectomised patients to divert tracheal air to oesophagus for production of voice.Prosthesis used to ventilate middle ear in otitis media with effusion is called a ''grommet" or ventilation tube.Septal button made of silicon or Teflon is used to close septal perforation.Stapes replacement prosthesis made of Teflon, tefwire, platinum or stainless steel is used in stapedectomy.