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': 'Gingivally the depth of a class V cavity is \nSelect and explain. \nA. 0.5 — 1 mm, B. 0.75 — 1mm, C. 1-1.25mm, D. 2-3mm', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]