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': 'Oral habit that occurs during intrauterine stage is: \nSelect and explain. \nA. Atypical swallowing, B. Tongue thrusting, C. Thumb sucking, D. Lip sucking', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Thumb sucking habit\xa0 is seen in the oral stage of development and is seen at 29 week of intrauterine life and may disappear during normal growth between the ages of 1 and 3.5 years.', 'role': 'assistant'}]