Which of the following diseases is caused by deficiency of insulin in the body?

The disease caused by deficiency of insulin in the body is diabetes mellitus. Insulin is a hormone produced by the pancreas that helps regulate the amount of sugar (glucose) in the blood. In people with diabetes, the body either doesn't produce enough insulin or can't effectively use the insulin it produces. Without enough insulin, the body can't properly regulate the amount of glucose in the blood, which can lead to high blood sugar levels. Over time, high blood sugar levels can cause damage to various organs and tissues in the body, leading to a range of health problems. Symptoms of diabetes can include increased thirst and urination, fatigue, blurry vision, and slow-healing wounds. Treatment typically involves managing blood sugar levels through diet, exercise, and medication, including insulin injections for people with type 1 diabetes who can't produce enough insulin on their own.