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': 'Which of the following is/are features of dishpan digit? \nSelect and explain. \nA. Reddened finger, B. Exceptionally clean thumb, C. Fibrous rough callus, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Dishpan digit\nFinger of the child who indulges in sucking habit. On examination, it will provide valuable information about the habits. They are:\n\nReddened.\nExceptionally clean thumb /\xa0nail / finger.\nFibrous rough callus.', 'role': 'assistant'}]