120387
During the years 1886 – 1902 , Wilhelm Hallwachs and Philipp Lenard investigated the phenomenon of photoelectric emission in detail .
 person: Wilhelm Hallwachs; person: Philipp Lenard
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: Wilhelm Hallwachs, Philipp Lenard 
Answer:
 person: Wilhelm Hallwachs; person: Philipp Lenard