Final answer:
Palafer's primary active ingredient is ferrous fumarate, which is used to treat iron deficiency anaemia.
Step-by-step explanation:
The primary active ingredient in Palafer is ferrous fumarate. Palafer is a medication commonly used in the treatment of iron deficiency anaemia. Anaemia often responds well to oral iron therapy, and apart from ferrous fumarate, other preparations like ferrous sulphate and ferrous gluconate are also used for this purpose. These iron supplements help in replenishing the iron stores in the body and increasing the hemoglobin levels, thereby treating anaemia.