Assertion: poison ivy's urushiol | /r/HasProperty | allergen
Facets:
Source sentences:
text: Urushiol is an allergen.
text: Urushiol is considered an allergen because it causes an allergic reaction — the rash and sometimes swelling.
text: Urushiol is an allergen.
text: Urushiol is considered an allergen because it causes an allergic reaction, which materializes on your skin and in your body as a rash and sometimes swelling.