A scrubber in the exhaust of a chemical industrial plant removes Gases like sulphur dioxide, Particulate matter of the size 5 micrometer or above, Gases like ozone and methane, Particulate matter of the size 5.5 micrometer or less.

The scrubber is a device used to remove pollution from smokestacks and exhaust systems. The scrubber is designed to capture both gases and solid particles. A scrubber can remove gases like sulphur dioxide when is passed through the water or lime droplets. It is mainly used in industrial chimneys. So, the correct answer is option A.