本題(ほんだい)main question, real issue at hand

逸(そ)れた話(はなし)を本題(ほんだい)に戻(もど)す。

Bring the sidetracked conversation back to the main question. {main question, real issue at hand}

議論(ぎろん)が途中(とちゅう)で本題(ほんだい)から外(はず)れました。

The discussion strayed from the main question halfway through. {main question, real issue at hand}

司会(しかい)：「さて、そろそろ本題(ほんだい)に入(はい)りましょう。」

Moderator: "Well, let's get to the main question/real issue at hand." {main question, real issue at hand}

部長(ぶちょう)：「世間(せけん)話(ばなし)はそのくらいにして、さて本題(ほんだい)に入(はい)ろうか。」

Chief: "Let's leave the small talk at that, shall we move on to the real issue at hand?" {main question, real issue at hand}

取引(とりひき)先(さき)：「時間(じかん)がないこととて…早速(さっそく)ですが、本題(ほんだい)に入(はい)らせてください。」

Client: "Given that we're short on time... Let's get straight to the real issue at hand, if you will." {main question, real issue at hand}