51455
From 1763 to 1767 , he studied geology under Jean-Étienne Guettard .
 person: Jean-Étienne Guettard
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: Jean-Étienne Guettard 
Answer:
 person: Jean-Étienne Guettard