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
[{'content': 'A Blom-Singer prosthesis is used: \nSelect and explain. \nA. 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', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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.', 'role': 'assistant'}]