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': 'What is the chief disadvantage of a nonfunctional fixed space maintainer? \nSelect and explain. \nA. Prevent lateral jaw growth, B. Difficult to fabricate, C. Difficulty in maintaining proper oral hygiene, D. Continued eruption of opposing tooth', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]