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
Materials used for injection in thyroplasty are 
Select and explain. 
A. Gelatin powder, B. Collagen, C. A cellular micronized human debris, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: 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