22
The results showed a significant increase in the concentration of lead , cadmium and arsenic in the blood and urine of smelters , while smoking more than 20 cigarettes a day caused a further increase in the concentration of these metals .
 Chemical: cadmium; Chemical: arsenic
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: cadmium, arsenic 
Answer:
 Chemical: cadmium; Chemical: arsenic