30591
In nuclear applications where graphite is used as a neutron moderator , accumulation of Wigner energy followed by a sudden , spontaneous release may occur .
 person: Wigner
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: Wigner 
Answer:
 person: Wigner