ANS:C - poise

In the CGS (Centimeter-Gram-Second) system, the unit of viscosity is the poise. The poise (P) is a unit of dynamic viscosity in the CGS system. It is defined as the viscosity required to maintain a force of 1 dyne per square centimeter to move a layer of fluid one centimeter per second past another layer of fluid, while maintaining a constant distance between the layers. Therefore, the correct answer is: poise.