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': 'Secondary impression with ZoE needed how much spacer thickness in tray? \nSelect and explain. \nA. 0.2 mm, B. 1.0 mm, C. 1.5 mm, D. 2.0 mm', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Due to minimal viscosity of Impression plaster and ZoE paste they do not need any spacer in custom tray (Means best option will be 0.0mm).', 'role': 'assistant'}]