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': 'What is the pH of set MTA? \nSelect and explain. \nA. 12.5, B. 14, C. 10, D. 8.5', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]