52885
This motion is named after the botanist Robert Brown , who first described the phenomenon in 1827 , while looking through a microscope at pollen of the plant " Clarkia pulchella " immersed in water .
 person: Robert Brown; plant: Clarkia pulchella
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: Robert Brown, Clarkia pulchella 
Answer:
 person: Robert Brown; plant: Clarkia pulchella