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 which of the following situations composites should be avoided: 
Select and explain. 
A. Fissure sealant, B. Root surface lesion, C. Preventive resin restoration, D. Posterior teeth restorations
B: Root surface lesion
Answer: B: Root surface lesion 
Explanation: Composites are usually contraindicated in root surface lesions as gap formation is seen as a result of the forces of polymerization shrinkage being higher than initial bond strength.  
Composites are effectively used for pit and fissure sealants, preventive resin restorations and core build ups.