返答 is read as へんとう (hentou) and means reply.
へんとう
hentou
へんとうしょ
reply letter
くちへんとう
talking back
へんとうしだい
depending on the answer
へんとうにきゅうする
to be embarrassed for a reply
へんとうにつまる
かえす
to do ... back (e.g. speak back, throw back)
かえる
to turn over
へんじ
reply
へんさい
repayment
へんじょう
return
へんしん
reply (e.g. email, fax, letter)
へんぴん
returned goods