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': 'The group of thumb sucking in which the thumb do not contact the lower incisors, according to Subtleny et al: \nSelect and explain. \nA. Group I, B. Group II, C. Group III, D. Group IV', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Subtleny et al (1973) noted four types of thumb-sucking depending upon the\n\nAmount of pushing of tongue inside the oral cavity\nThe contact between the thumb and the palate\xa0\nThe contact between the thumb and anterior teeth.', 'role': 'assistant'}]