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': 'Guiding plane in RPD should be located at: \nSelect and explain. \nA. In between edentulous space, B. Abutment surface adjacent to an edentulous area, C. Edentulous areas, D. Abutment area', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]