19409
The remaining four groups received same concentrations of Mn and were also exposed to ELF - MF ( 1 . 5 mT ; 50 Hz ) for 4 h for 5 days a week during 45 days .
 Chemical: Mn
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: Mn 
Answer:
 Chemical: Mn