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: ENT
[{'content': "Rienke's edema in vocal cord is \nSelect and explain. \nA. Mucosal, B. Submucosal, C. Muscular layer, D. Involves all the layer", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]