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': 'Purpose of tilting the cast, while surveying is to: \nSelect and explain. \nA. Achieve maximum guiding planes, B. Create undercuts, C. Obtain a favorable path of insertion, D. Obtain retention', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]