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': 'Consider the following factors regarding the placement of R.P.D, which of the following determine the path of placement? \nSelect and explain. \nA. Guiding planes, B. Retentive areas, C. Interferences, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]