21904
In the area of research , it has yet to be seen how this concept may be incorporated feasibly , for example , into the harm - benefit analysis , which is the prerequisite for the approval of an animal experiment .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None