How Do You Know Which Is the True Church?

Yesterday, I went to the Legion of May's Patrician meeting (actually a developmental meeting) where different wrong perceptions of the Catholic Church were discussed. Too many, among them,"How do you know your church is the true Church?" Or, "How do you know which is the True Church." Though I teach this in my RCIA, it's still so refreshing to have a member of the diocese confirm that I'm in the right track in what I'm sharing--an approach no rational person can argue against: that Jesus Christ founded only one Church meant to embrace all in one fold throughout eternity: the Catholic Church, the only one that came from the apostles. (To be continued---too groggy to open my eyes.)