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': 'Isshiki thyroplasty type I is - \nSelect and explain. \nA. Lateralization of the vocal cord, B. Medialization of the vocal cord, C. Shortening of the vocal cord, D. Lengthening of the vocal cord', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]