What is Answer ?
Answer is (noun) a reply, letter or conversation after someone has written or spoken to you, asking you a question I phoned his office but there was no answer. Have you had an answer to your letter yet? in answer to as a reply to I am writing in answer to your letter of October 6th. (verb) 1. to reply, to speak or write words to someone who has spoken to you or asked you a question He never answers my letters. When he asked us if we had enjoyed the meal we all answered ‘yes’. 2. to answer the phone to speak and listen to a telephone caller When I called, it was his secretary who answered the phone. to answer the door to open the door when someone knocks or rings He jumped out of the shower and answered the door dripping wet with a towel round his waist.
source: Easier English, Student Dictionary Upper Intermediate Level