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': 'A fixed bridge with pontics rigidly fixed to the retainers \nprovides: \nSelect and explain. \nA. Strength to the abutments, B. Reduction of stress associated with restoration, C. Aesthetics to the fixed bridge, D. Reciprocation of forces acting on the pontic', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]