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': 'Metal ceramic restorations fail usually due to fracture of\nthe cervical material. This can be avoided if: \nSelect and explain. \nA. Occlusal forces are minimal, B. Casting is so designed as to reduce stress on ceramic material, C. Metal is not more than 0.5 mm thick, D. Ceramic is at least 1.5 mm thick', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]