11601
Examples of applications in biological / medicinal chemistry and in crystal engineering are mentioned , taking note that halogen bonding can be " tuned " to fit various requirements , that is , strength of interaction , steric factors , and so forth .
 Chemical: halogen
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: halogen