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Joseph von Fraunhofer discovered about 600 bands in the spectrum of the Sun in 1814 – 15 , which , in 1859 , Gustav Kirchhoff ascribed to the presence of different elements .
 person: Joseph von Fraunhofer; person: Gustav Kirchhoff
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: Joseph von Fraunhofer, Gustav Kirchhoff 
Answer:
 person: Joseph von Fraunhofer; person: Gustav Kirchhoff