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': 'The depth of cure for lighter shades of composites is often: \nSelect and explain. \nA. 2 mm, B. 3 mm, C. 4 mm, D. 5 mm', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The boundary between somewhat cured and uncured material is called the depth of cure and is often 5 mm for light vita shades (A2 or A3) of material.', 'role': 'assistant'}]