Knipperle - Knipperle is a traditional French variety of white wine grape from Alsace. It's not listed for use in AOC wine but is a minor component of blends for local drinking in some ways an Alsatian equivalent of its sibling Aligote in Burgundy. Given a choice of categories company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, the text refers to which one?
A:
Plant