Assertion: Thin layer chromatography is an adsorption chromatography.
Reason: A thin layer of silica gel is spread over a glass plate of suitable size in thin layer chromatography which acts as an adsorbent. 
In the light of the above statements, choose the correct answer from the options given below:

The separation of mixture components over a thin layer of an adsorbent placed on a glass plate is the process of thin layer chromatography (TLC), another kind of adsorption chromatography.  A thin coating, approximately 0.2 mm in thickness, of an adsorbent such as silica gel or alumina is applied on a glass plate of an appropriate size.