The condition of vitamin deficiency is known as

Given: It is given in the question that there are diseases that are caused by vitamin deficiency.

The concept used: Biomolecules

Detailed solution: Vitamin deficiency is the condition of a long-term lack of a vitamin. The condition of vitamin deficiency is known as Avitaminosis. It refers to any disease caused by long-term vitamin deficiency, such as thiamine deficiency, vitamin A deficiency, vitamin K deficiency, niacin deficiency, vitamin B12 deficiency, etc. On the other hand, hypervitaminosis refers to a disease caused by the overconsumption of fat-soluble vitamins in the body. Thus, the condition of vitamin deficiency is known as Avitaminosis.

Hence, the correct answer is option B) Avitaminosis.