9424
The PCBs in the PEs at 79 m downstream of the contamination source were dominated by low K ( OW ) congeners , similar to those in the mixture of Aroclors 1016 and 1254 ( 4 : 1 v / v ) historically released from the former capacitor manufacturer .
 Chemical: PCBs; Chemical: Aroclors 1016 and 1254
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: PCBs, Aroclors 1016 and 1254 
Answer:
 Chemical: PCBs; Chemical: Aroclors 1016 and 1254