Beriberi is a disease caused by a deficiency in vitamin B1 (thiamine), not vitamin C. It comes in two forms: wet beriberi, which affects the cardiovascular system, and dry beriberi, which impacts the nervous system. Symptoms may include muscle weakness, nerve damage, rapid heartbeat, confusion, and even heart failure. This condition is often seen in individuals with severe alcoholism or malnourishment, particularly where refined carbohydrates are consumed without sufficient whole foods. While beriberi, scurvy, and rickets are all caused by vitamin deficiencies, each is linked to a different vitamin. Vitamin C deficiency causes scurvy, vitamin D deficiency causes rickets, and vitamin B1 deficiency causes beriberi. So, when asked which disease results from a lack of vitamin C, the clear and correct answer is scurvy.