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': 'Materials used for injection in thyroplasty are \nSelect and explain. \nA. Gelatin powder, B. Collagen, C. A cellular micronized human debris, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Materials used for medialization of the vocal cord include--fat, fascia, gelatin powder, collagen and micronized acellular human dermis. Ref:- Neurologic disorder of larynx by Andrew Bilitzer; pg num:- 152', 'role': 'assistant'}]