"I have a quick question," said the attendee, who was wearing a tee shirt of a nearby LGBT community center while the candidate walked down a rope line and greeted supporters. "Do you think I chose to be gay?"
"Did you choose to be gay?" Carson responded.
"Yes, do you think I chose to be gay?" the attendee asked again.
"That’s a long conversation," Carson said and repeated as he posed for a photograph with a supporter.
"I think you’re full of s---," his questioner responded, smiling, before walking away.
"OK," was Carson's only response as he continued to pose for pictures.
Last March, Carson was criticized for saying in an interview with CNN that being gay is a choice, for which he quickly apologized. He also took heat in November last year for saying transgender people should have separate bathrooms because they "make everybody else uncomfortable."