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': 'Which of the following acts as accelerator in Zinc oxide eugenol: \nSelect and explain. \nA. ZnCl2 + Eugenol, B. ZnCl2 + ZnSO4, C. Eugenol + ZnO, D. Zn(OH)2 + ZnO', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]