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': 'Setting time of ZOE is best controlled by \nSelect and explain. \nA. Adding a drop of eugenol, B. Adding a drop of water, C. Cooling the glass slab, D. Altering ratio of two pastes', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The clinician can shorten setting time by adding a small amount of zinc acetate or additional accelerator or a drop of water in the paste before mixing or by extending the mixing time. Although these methods affect the property of the cement adversely, the use of a cool spatula and mixing slab is also effective in prolonging the setting time and is the recommended method to control setting time.\n\xa0\nReference: PHILLIPS’ SCIENCE OF DENTAL MATERIALS, 12th ed page no 179', 'role': 'assistant'}]