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': 'When making complete denture the occlusal plane should be parallel to the \nSelect and explain. \nA. Frankfort horizontal plane only, B. Interpupillary Line only, C. Campers plane only, D. Campers plane and interpupillary line', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]