This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: ENT
[{'content': 'Substance associated with minimal tissue reaction in injection laryngoplasty is: \nSelect and explain. \nA. Fat, B. Gelfoam, C. Calcium hydroxyapatite, D. Bioplastique', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Injection laryngoplasty uses various materials. The use of calcium hydroxylapatite in this context is a recent development and appears to generate minimal tissue reaction and produce a long-lasting result.', 'role': 'assistant'}]