Combine Cells and add a text

So I have Columns " A" Last names and column " B" First names

I am currently using =B1&" "&A1 in column C

and that gives me First Name Last Name

Now I want to be able to add a Mr/Mrs/Dr in front of the names is there a way to do that without making a column for the Mr. and Mrs

edit: I want to be able to type in the Mr/Mrs/Dr myself in the cell with the formula