What to be?

A Catholic nun -- Sr. Mary-Louise -- asks her 4th grade class what
they'd like to be when they grow up.  She first asks Claire...

"I wanna be an astronaut!"

"Oh, that's a fine, fine career, Claire," the sister responds.
"And you, Jimmy?"

"I wanna be a firefighter!"

"Another fine idea, Jimmy.  And you, Patricia?  What do you want
 to be when you grow up?"

"I wanna be a prostitute!"

Visibly shaken, the sister manages: "I....I don't think I heard
you correctly, Patricia!  You said you want to be a WHAT??!?!"

"A prostitute."

"OH!", sighs Sr. Mary-Louise with relief.  "Thank the Lord.
 I thought you said you wanted to be a Protestant!"