68004
A few particularly fissile and readily obtainable isotopes ( notably U , U and Pu ) are called nuclear fuels because they can sustain a chain reaction and can be obtained in large enough quantities to be useful .
 location: U; location: Pu
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: U, Pu 
Answer:
 location: U; location: Pu