I want to know the answer to the following question:
Who made the observation that the Japanese sailor's diet was the cause for them developing beriberi?
All the background I'm provided with is that "In the early 1880s, Kanehiro Takaki observed that Japanese sailors (whose diets consisted almost entirely of white rice) developed beriberi (or endemic neuritis, a disease causing heart problems and paralysis), but British sailors and Japanese naval officers did not.". Is that enough to answer the question?
Answer: yes