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: Anatomy
[{'content': 'Length of trachea - \nSelect and explain. \nA. 10-12 cm, B. 1 cm -10 cm, C. 15 cm, D. 22.5 cm', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Trachea is around 10-15cms.', 'role': 'assistant'}]