Step 1: Match each disease with its corresponding deficiency.
A. Beriberi is caused by a deficiency of Thiamin (Vitamin B1). → II B. Megaloblastic Anemia is due to deficiency of Folic acid. → III C. Scurvy results from a deficiency of Ascorbic Acid (Vitamin C). → IV D. Pernicious Anemia is linked to a deficiency of Cobalamin (Vitamin B12). → I
Step 2: Compile the correct matches:
A - II, B - III, C - IV, D - I