Deficiency of which vitamin causes Beribery?

The deficiency of Vitamin-B1 causes Beribery.
Beriberi is a disease caused by a Vitamin-B1 deficiency, also known as thiamine deficiency. It often occurs in developing countries among people with a diet that consists mostly of white rice or highly refined carbohydrates.
To prevent beriberi, one should eat a nutrient-rich diet that includes foods rich in thiamine, that are beans, legumes, seeds, meat, fish, whole grains, nuts, dairy, etc.