Among the following varnish Which of the following has flouride concentration less than duraphat but having equivalent efficacy:

Flouride varnish was first developed in Europe by Schimdt. They maintain the fluoride ions in intimate contact with enamel for longer periods. The two commonly used varnishes are – Duraphat: It is the first flouride varnish and contains 22600 ppm fluoride as NaF in a neutral colophonium base (NaF varnish containing 2.26% fluoride in organic lacquer) Fluor Protector (Fluoride concentration is about 7000 ppm or 0.70%) Carex: Contains a lower fluoride concentration than Duraphat--(1.8%  fluoride) and has efficacy equivalent to that of Duraphat. Duraflour - 22.6 mg/ml. Contains NaF in alcoholic suspension of natural resins with xylitol as sweetening agent. Cavity shield: 5% NaF in resinous base.