9679
In 1839 , Justus von Liebig , Friedrich Wöhler and Jöns Jacob Berzelius stated that yeast was not an organism and was produced when air acted on plant juice .
 person: Justus von Liebig; person: Friedrich Wöhler; person: Jöns Jacob Berzelius
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 person: Justus von Liebig; person: Friedrich Wöhler; person: Jöns Jacob Berzelius