LONDON -- For many in Britain, one of the most puzzling moments of CNN’s GOP debate was when Jeb Bush named Margaret Thatcher as the woman he’d like to see on the $10 bill.

At the end of the three-hour debate, after covering topics veering from the nuclear accord with Iran to U.S.-Russia relations, moderator Jake Tapper threw the contenders what appeared to be a softball question: "Earlier this year, the Treasury Department announced that a woman will appear on the $10 bill. What woman would you like to see on the $10 bill?"

“I would go with Ronald Reagan's partner, Margaret Thatcher. Probably illegal, but what the heck?” replied the former governor of Florida.

Upon hearing  that Bush had plumped for the former British leader, enterprising folks on social media quickly mocked up a $10 note with Thatcher’s face on it.

Bush's answer certainly stood out from those of the other 10 contenders: Mike Huckabee chose his wife, Marco Rubio and Ted Cruz went with Rosa Parks, Rand Paul picked Susan B. Anthony, Donald Trump his daughter, and Scott Walker opted for Clara Barton. Chris Christie picked Abigail Adams, John Kasich said Mother Teresa, and Ben Carson chose his mother. Carly Fiorina said she wouldn’t change the bill.

But the Iron Lady? Thatcher was one of Britain’s most transformative and controversial leaders, serving as prime minister from 1979 to 1990. Some mourned her passing in 2013; others held street parties.

And Thatcher was just as divisive Thursday on Twitter as she was when she served as Britain's first female prime minister.