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
In 7-year-old patient; 74 and 85 are indicated for extraction; which of the following will be appropriate space maintainer for the child? 
Select and explain. 
A. Bilateral band and loop, B. Lingual arch, C. Nance space maintainer, D. None of the above
A: Bilateral band and loop
Answer: A: Bilateral band and loop 
Explanation: Band and loop space maintainer 
Advantages

Effective space maintainer for unilateral loss of single tooth in buccal segments.
Economical to make and construct.
Little chairside time, if preformed bands are used.
Adjusts easily to accommodate the changing dentition.

Reference: Pediatric Dentistry Principles and Practice SECOND EDITION, MS Muthu; pdf no 1012