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': 'During cap stage signalling in odontogenic epithelium is done by? \nSelect and explain. \nA. Dental follicle, B. Enamel knot, C. Dental papilla, D. Inner enamel epithelium', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]