29574
Samples of tissues were also used to estimate Cr accumulation and alterations in zinc , copper , and iron levels .
 Chemical: Cr; Chemical: zinc; Chemical: copper; Chemical: iron
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: Cr, zinc, copper, iron 
Answer:
 Chemical: Cr; Chemical: zinc; Chemical: copper; Chemical: iron