Assertion: yam's vitamin c | /r/HasProperty | important antioxidant
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Source sentences:
text: A 100-gram (3.5 oz) serving of oca provides almost 40 milligrams of vitamin C, an important antioxidant that plays a key role in maintaining a healthy immune system and preventing premature aging.
text: A single cup of this root boasts more than 42mg of vitamin C, an essential antioxidant, along with beta-carotene, vitamin E, and many other plant-based nutrients.
text: An 8-ounce portion of sweet potato also provides between 20 and 50 percent of your daily need for vitamin C, an important antioxidant, and the B-vitamins B-6, thiamin, niacin, riboflavin and pantothenic acid, all necessary for food metabolism and maintenance of healthy cells, according to the University of Maryland Medical Center.