He answered to the question.

先你補充的內容回應，你見到有些時候answer to不於「對」的寫法，甚至是高官或議員的講稿都會是用/寫錯英文的。

answer to只有一個解釋：向某上級或高層負責。或以香港的用語：「問責」。例如問責官員是否向市民問責還只是向特首問責 - 便會用 xxx (Head of a Bureau) answers to the public or only answers to the Chief Eexcutive?

Answer to不是帶不帶出要問/答的意思，你意會錯了。

(1) ? Jack answered to the question.
請問 answer 之後要不要用 to 來引介所回答的事物?
Jack answered the question.

(2a) ? Jack answered the question to his teacher.
(2b) ? Jack answered his teacher the question.
如果同時要引介所回答的人以及事物, 要不要用 to 來引介所回答的人?
2a錯
2b對

(3a) ? "I will not join the party," answered Jack to his friends.
(3b) ? "I will not join the party," answered Jack to the invitation.
如果已經有個 quotation 做 direct object, 可不可以用 to 來引介所回答的人(如3a)或事物(如3b)?
3a錯
3b錯

(4) ? Jack answered to the invitation that he would not join the party.
把(3b)轉為 reported speech, 可不可以用 to 來引介所回答的事物?
錯，不會/不需要用to.
Jack answered the invitation that he would not join the party.

以上所有你用錯的answer to如果照寫法譯為中文意思是：
1. Jack向一條問題負責任。
2. 畫蛇
4.Jack對邀請負上責任，就是他不會出席。