Iodine : Goitre :: Vitamin C : ? Choose the term that completes the analogy.

The relation is a nutrient : the disorder that follows when the body goes short of it. Too little iodine brings on goitre; too little vitamin C brings on scurvy, with bleeding gums and slow healing. Each distractor is a genuine deficiency disorder belonging to a different nutrient, which is the trap — rickets follows a want of vitamin D, anaemia a want of iron and night blindness a want of vitamin A.