Assertion: onion | /r/MadeOf | calcium
Facets:
Source sentences:
text: Onions contain calcium too and can help in this regard (41).
text: It contains sulfuric compounds and quercetin, and minerals such as magnesium, calcium, potassium, sodium, selenium, and phosphorus.
text: Onions contain many important and essential minerals and vitamins, such as vitamins C and B6, calcium, magnesium, and potassium.