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': 'First formed hard tissue in the tooth is: \nSelect and explain. \nA. Enamel, B. Dentine, C. Pulp, D. Cementum', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Dentin is first hard tissue in tooth to be formed (From DEJ towards pulp).\nEnamel is 2nd (just after 1st layer of dentin formed) hard tissue in tooth to be formed (from cuspal or incisal area).', 'role': 'assistant'}]