Correct Answer: (b) Beri beri
Solution:Beri beri is a disease caused by a deficiency of thiamine (vitamin B1) in the diet. It is not caused by bacteria or viruses, so it cannot be prevented by vaccination. The best way to prevent beri beri is to ensure that the diet includes adequate amounts of thiamine-rich foods such as whole grains, nuts, seeds, and lean meats. In cases of severe deficiency, thiamine supplements may also be prescribed.