1921
He appears as a minor character in Brian Clevinger 's comic book series " Atomic Robo " , as an acquaintance and fellow-scientist of Nikola Tesla , having been driven insane by his involvement in the Tunguska event which exposed him to the hidden horrors of the wider universe .
 person: Brian Clevinger; person: Nikola Tesla
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Brian Clevinger, Nikola Tesla 
Answer:
 person: Brian Clevinger; person: Nikola Tesla