Josh was a participant in a clinical study to determine how much thiamin cures beriberi, the vitamin's deficiency disease. During the study, Josh consumed only a formula diet that was nutritionally complete, except it didn't contain thiamin. Within a few weeks, Josh developed beriberi. At that point, researchers gave 0.2 mg of thiamin to Josh each day for a week, but his signs and symptoms of beriberi remained. In the weeks that followed, the scientists continued to increase Josh's intake of the vitamin by 0.2 mg/week. After a week of taking 0.6 mg of thiamin/day, Josh reported feeling much better. Based on this information, the researchers concluded that Josh's
A. RDA for thiamin was 0.6 mg/day.
B. AMDR for thiamin was between 0.2 and 0.6 mg/day.
C. requirement for thiamin was 0.6 mg/day.
D. UL for thiamin was 0.2 mg/day.
Answer: C
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