Assertion: onion | /r/MadeOf | selenium
Facets:
Source sentences:
text: Onions contain selenium that stimulates immune function.
text: Also, onion contains selenium, which supports the vitamin E in your eyes, thus improving the protection of the eye cells.
text: It contains sulfuric compounds and quercetin, and minerals such as magnesium, calcium, potassium, sodium, selenium, and phosphorus.