17179
We used Fourier transform infrared spectroscopy to investigate the interactions between lecithin and bile salts / acids and found that different bile salts / acids employ different functional groups to form hydrogen bonds with lecithin .
 Chemical: bile salts / acids; Chemical: bile salts / acids; Chemical: hydrogen
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: bile salts / acids; Chemical: bile salts / acids; Chemical: hydrogen