Assertion: poison ivy's substance | /r/Causes | the rash
Facets:
Source sentences:
text: You spread the rash only if urushiol oil -- the sticky, resinlike substance that causes the rash -- has been left on your hands.
text: Its leaves and stems produce an oily substance that is itchy to the human skin and causes rashes.
text: ’s urushiol (the oily substance that causes the rash) can vary.
text: Some people have such a severe reaction to urushiol (the toxic substance that causes the rash) that they need to visit a physician.
text: You spread the rash only if urushiol oil -- the sticky, resinlike substance that causes the rash -- has been left on your hands.