Field is a synonym of Respond. the last thing you do when you Listen is Respond. Listen is related to Hearing. 
Aids is a type of Virus. Virus can cause/lead to Disease. Disease is related to Medical. Medical is related to Cure. 
Field <--Synonym--> Respond <--HasLastSubevent-- Listen <--RelatedTo--> Hearing 
Aids --IsA--> Virus --Causes--> Disease <--RelatedTo--> Medical <--RelatedTo--> Cure 