# Primer is a:
A. Acid etching agent
B. Adhesion promoting agent
C. Coupling agent
D. Bonding agent
The correct answer is B. Adhesion promoting agent.
PRIMERS are hydrophilic monomers, which are applied over the etched/conditioned surfaces for the easy flow of bonding agents. Eg. 2-HEMA and HEMA dissolved in acetone or alcohol.
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