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: Surgery
[{'content': "Ashley's flap is: \nSelect and explain. \nA. Palatal rotation flap., B. Buccal pedicle flap., C. Buccal free flap., D. Palatal free flap.", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]