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': 'Rake angle is negative \nSelect and explain. \nA. If rake face is before/ahead of radial line, B. If rake face is inline with radial line, C. If rake face is behind radial line, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]