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': 'When selecting the colour of cement to use for cementing a porcelain jacket crown, the powder being tested is best mixed with: \nSelect and explain. \nA. Glycerin-water solution, B. Cement liquid, C. Alcohol, D. Only water', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Self-cured and dual-cured materials can be opaque or translucent, and those indicated for cementation of ceramic restorations are usually provided in several shades. Light-cured materials are indicated for bonding of laminated ceramic veneers (esthetic cements) or orthodontic brackets. Some esthetic resin cements used for cementation of veneers include glycerin-based, water-soluble “try-in” pastes to help with shade selection.\nReference: Craig’s\xa014th ed page no 289', 'role': 'assistant'}]