The correct answer is option 1, Anaemia. Iron deficiency is one of the leading causes of anaemia. Anaemia is a condition characterized by a decrease in the number of red blood cells or a decrease in the amount of hemoglobin in the blood. Hemoglobin is the protein in red blood cells that carries oxygen to the body`s tissues. Iron is essential for the production of hemoglobin, and without enough iron, the body cannot produce an adequate number of healthy red blood cells.

Option 2, Scurvy, is caused by a deficiency of vitamin C, not iron. Scurvy is characterized by weakness, gum disease, and skin problems.

Option 3, Rickets, is caused by a deficiency of vitamin D or calcium, not iron. Rickets is a condition that affects bone development in children, leading to weak and brittle bones.

Option 4, Cholera, is an infectious disease caused by the bacterium Vibrio cholerae and is not related to iron deficiency. Cholera is typically transmitted through contaminated food or water and causes severe diarrhea and dehydration.

Therefore, the correct answer is option 1, Anaemia.