22896
The formaldehyde lies in the FCF plane of difluoromethane , linked through a C - HF and a bifurcated CH2O weak hydrogen bonds .
 Chemical: formaldehyde; Chemical: FCF; Chemical: difluoromethane; Chemical: C - HF; Chemical: CH2O; 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: formaldehyde, FCF, difluoromethane, C - HF, CH2O, hydrogen 
Answer:
 Chemical: formaldehyde; Chemical: FCF; Chemical: difluoromethane; Chemical: C - HF; Chemical: CH2O; Chemical: hydrogen