Concept:Piglet anaemia is an iron-deficiency condition common in young piglets.Explanation:Piglets are born with very low reserves of iron in their bodies.Sow's milk contains very little iron to supply the growing piglets.As a result, the piglets develop anaemia due to lack of iron.Therefore, the most effective control is giving iron supplements or iron drugs.Sulphur drugs, anthelmintics, and antibiotics do not treat mineral deficiency.Answer:B. Iron drugs.