Which one of the following is not a ferromagnetic material?

Ferromagnetic materials are those which can be strongly magnetized and retain their magnetism. Iron, cobalt and nickel are the three classic elemental ferromagnetic materials. Certain compounds like ferric chloride (FeCl3) also exhibit magnetic properties due to iron content. Silver, on the other hand, is diamagnetic — it is weakly repelled by a magnetic field and does not exhibit ferromagnetism. Hence silver is the correct answer as the non-ferromagnetic material.