Assertion :The viscosity of water is less than blood. Reason: The viscosity of liquids decreases with increase in temperature.
Whole blood has a much higher viscosity than water, as blood is thicker than water. Unlike the water, blood is non-Newtonian because its viscosity increases at low flow velocities. Blood is more viscous than water.
Also, the viscosity of the liquid decreases with a rise in temperature whereas it increases for the gases.
But the given reason is not appropriate for the assertion.
So, option B is correct.