Poise is the unit of A. surface tension B. capillarity C. viscosity D. shear stress in fluids

The correct answer is C. Viscosity.

Poise is the unit of dynamic viscosity, which is a measure of a fluid’s resistance to flow. It is defined as the ratio of the shear stress to the rate of shear strain.

Surface tension is the force that acts at the surface of a liquid, causing it to behave as if it were covered by an elastic skin. It is caused by the attraction between the molecules of the liquid.

Capillarity is the ability of a liquid to flow in narrow spaces without the assistance of,