Which of the following is an example of a non-Newtonian fluid?

Option 3 : Peanut butter

Non-Newtonian fluid:

• A non-Newtonian fluid is a fluid that does not follow Newton's law of viscosity.
• Non-Newtonian fluids can switch between a solid and liquid state depending on the forces acting upon them.
• So, peanut butter is a great example of a non-Newtonian fluid because in one minute it behaves like a solid, and the next it flows like a liquid.​

Newtonian fluid:

• A Newtonian fluid is a fluid in which the viscous stresses arising from its flow are at every point linearly correlated to the strain rate.
• Newtonian fluids obey Newton's law of viscosity. 
• Water, air, alcohol, glycerol, and thin motor oil are all examples of Newtonian fluids.