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: Dental
[{'content': 'The largest component of gutta percha cones is \nSelect and explain. \nA. Gutta percha, B. Zinc oxide, C. Resins and waxes, D. Colouring agents', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]