An example for hydrophobic sol among the following is

Which of the following is lyophobic in nature?

Give information about the applications of colloids.

Which among the following is an example of an emulsion?

$A$ sol contains positively charged colloidal particles. Which of the following solutions will require the minimum concentration for its coagulation?

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A)$: Dissolved substances can be removed from a colloidal solution by diffusion through a parchment paper.
Reason $(R)$: Particles in a true solution cannot pass through parchment paper but the colloidal particles can pass through the parchment paper.
In the light of the above statements,choose the correct answer from the options given below.