In 7-year-old patient; 74 and 85 are indicated for extraction; which of the following will be appropriate space maintainer for the child?
Bilateral band and loop
Lingual arch
Nance space maintainer
None of the above
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