209735
Formed in 1991 , they are known to incorporate elements from styles such as thrash , power , progressive , and neo-classical metal into their songs , and also makes use of acoustic guitars and a wide range of vocal styles .
 None
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:  
Answer:
 None