Assertion: selenium | /r/HasProperty | reclassified as essential micronutrient
Facets:
value: in a balanced human diet
type: LOCATION
value: in 1989
type: TEMPORAL
Source sentences:
text: In 1989, selenium was reclassified as an essential micronutrient in a balanced human diet when the National Research Council established the first recommended daily allowance (RDA) for it.