Dr. Ben Carson has just responded to the new attack by Donald Trump, who likened Carson's "pathological" temper years ago to a "child molester."

'He's Clueless, Uninformed': Graham Blasts Trump's 'Meltdown' in Iowa

In a 90-minute speech, Trump also wondered if those who support Carson are "stupid" for believing the retired neurosurgeon's life story. 

"How stupid are the people of Iowa? How stupid are the people of this country to believe this crap?" he asked, launching into a diatribe about Carson's past.

"I'm not saying it. He actually said 'pathological temper,' and then he defined it as disease. ... If you're pathological, there's no cure for that, folks. If you're a child molester, a sick puppy, there's no cure for that. There's only one cure. We don't wanna talk about that cure," he said. 

Responding today in South Carolina, Carson joked that Trump's advisers should explain the word "pathological" to him.

"It does not denote 'incurable.' That is not the same. It simply is an adjective that describes something that is highly abnormal. And something that, fortunately, I've been able to be delivered from for half a century now," he said.

Carson has written in his book about having had a "pathological" temper in his younger years and being violent, and that he changed after he embraced Christianity.  

Watch the comments above, and hear from Carson in a "Fox News Sunday" exclusive interview at 2/6p ET on Fox News Channel.

Malkin: Illegal Immigration Is 'Elephant in the Room' for Many GOP Candidates

Trump: My Deportation Plan Is Not 'Mean-Spirited'

O'Reilly Presses Activist on Chicago Gun Violence: 'Nothing Is Being Done'