hi, you might mean "respond" rather of 'correspond', right? you REPLY not necessarily to a question but even to something else. you ANSWER a question. you RESPOND to a question by giving a reply or an answer (and even reaction in other form). :)

Answer and reply are synonyms. "Correspond" has a different meaning. It can either mean: That somene agrees on something, or that something is in conformity. "Corresponding with the Queen's wishes". That something/someone matches something else. "The rainfall this month is not as high as the corresponding month last year." To communicate by letter. "I'm corresponding with a person in Turkey".