4853
reporter : though no trace of biological toxin was found in the trucks , u . s . intelligence officials say they have largely eliminated any other possible use for the fermenters and other equipment .
 u . s, u . s . intelligence officials, they, the trucks, no trace of biological toxin, biological toxin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 u . s, u . s . intelligence officials, they, the trucks, no trace of biological toxin, biological toxin