11780
During the first half of the 15th century , the achieving of the effect of realistic space in a painting by the employment of linear perspective was a major preoccupation of many painters , as well as the architects Brunelleschi and Alberti who both theorised about the subject .
 person: Brunelleschi; person: Alberti
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: Brunelleschi, Alberti 
Answer:
 person: Brunelleschi; person: Alberti