6690
The greatest reduction was achieved with 0 . 2 M sulphite by 68 % compared to 0 M sulphite , suggesting that sulphite plays an important role in the formation of carcinogenic 4 - MI in caramel colour .
 Chemical: sulphite; Chemical: sulphite; Chemical: sulphite; Chemical: 4 - MI
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: sulphite, sulphite, sulphite, 4 - MI 
Answer:
 Chemical: sulphite; Chemical: sulphite; Chemical: sulphite; Chemical: 4 - MI