53758
The equation was written in 1961 by Frank Drake , not for purposes of quantifying the number of civilizations , but as a way to stimulate scientific dialogue at the first scientific meeting on the search for extraterrestrial intelligence ( SETI ) .
 person: Frank Drake
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: Frank Drake 
Answer:
 person: Frank Drake