3143
Their properties were first well understood in the late 1800 s , following the 1869 work of Christian Wilhelm Blomstrand .
 person: Christian Wilhelm Blomstrand
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: Christian Wilhelm Blomstrand 
Answer:
 person: Christian Wilhelm Blomstrand