The correct answer is C. Tuliposide A.

This is a peruvian lily which has tuliposide A as its sensitizer. Poison ivy’s sensitizer is pentadecylcatechol which is in the urushiol. Sesquiterpene lactone is the sensitizer for the asteraceae family. Diallyl disulfide is the sensitizer for the alliaceae family which includes onions and garlic. Primin is the sensitizer for the primrose.

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