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
What is the chief disadvantage of a nonfunctional fixed space maintainer? 
Select and explain. 
A. Prevent lateral jaw growth, B. Difficult to fabricate, C. Difficulty in maintaining proper oral hygiene, D. Continued eruption of opposing tooth
D: Continued eruption of opposing tooth
Answer: D: Continued eruption of opposing tooth 
Explanation: None