5144
Certain bacterial species in the colon survive by cross - feeding , using either the breakdown products of complex carbohydrate degradation or fermentation products such as lactic acid for growth .
 Chemical: carbohydrate; Chemical: lactic acid
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: carbohydrate; Chemical: lactic acid