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': 'Porosity in porcelain can be prevented by: \nSelect and explain. \nA. Thoroughness of condensation, B. Rapidity of firing, C. High firing temperature, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]