Note : In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

Sulphide ores are wetted by oil and gangue particles are wetted by water. A paddle agitates the mixture which leads to the formation of froth. Froth carries away the minerals. Cresols are used to stabilise the froth but that is not the reason for concentrating sulphide ores by this method. So, the two statements are individually correct but second statement is not the reason.