Multiple choice Directions: In which year given discovery/invention was made: Cause of Beriberi 1968 1897 1939 1969 Reveal answer Fill a bubble to check yourself B Correct answer Explanation Christiaan Eijkman discovered that beriberi was caused by a deficiency in the diet, specifically lack of thiamine (vitamin B1), through his work with polished rice in 1897. This was a crucial discovery in understanding nutritional diseases.