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': 'Advantage of palatal strap: \nSelect and explain. \nA. Increased rigidity with Less bulk, B. Increased retention of appliance, C. Can be used in Kennedy class I partial dentures, D. More economical and comfortable to patient', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]