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
Which type of composite is most useful in class V lesions in bruxism patients? 
Select and explain. 
A. Packable composites due to increased viscosity, B. Microfilled due to low modulus of elasticity, C. Macrofilled due to low filler content, D. None of the above
B: Microfilled due to low modulus of elasticity
Answer: B: Microfilled due to low modulus of elasticity 
Explanation: The low modulus of elasticity of microfilled composites allow them to flex with tooth and protect the bonding interface. This is most useful in bruxism, clenching and stressful occlusion where flexure forces are high.