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': 'Type I thyroplasty is for - \nSelect and explain. \nA. Vocal cord medialization, B. Vocal cord lateralization, C. Vocal cord shortening, D. Vocal cord lengthening', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Type 1: Medial displacement of vocal cord (done by injection of gel foam/Teflon paste)\nType 2: Lateral displacement of the cord (done to improve the airway).\nType 3: Shortening (relax) the cord, to lower the pitch (gender transformation from female to male).\nType 4: Lengthening (tightening) the cord, to elevate the pitch (gender transformation from male to female).', 'role': 'assistant'}]