10845
The strong and direct evidence is derived by the observation of through - space couplings , such as , ( 1h ) J ( FH ) , ( 1h ) J ( FN ) , and ( 2h ) J ( FF ) , where the spin polarization is transmitted through hydrogen bond .
 Chemical: FH; Chemical: FN; Chemical: FF; Chemical: hydrogen
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: FH, FN, FF, hydrogen 
Answer:
 Chemical: FH; Chemical: FN; Chemical: FF; Chemical: hydrogen