Hillary Rodham Clinton grew up in Chicago and has lived in New York for more than a decade, but she will not answer a simple question: Which city has better pizza?

"I'm not going to tell a soul publicly," she said Tuesday night on “The Late Show With Stephen Colbert.”

It was a lighthearted moment for Clinton, the front-runner for the Democratic presidential nomination, who also discussed Republican candidates Donald Trump and Ben Carson with Colbert, as well as her favorite television shows.

When asked whether she'd rather run against Trump, a billionaire businessman, or Carson, a retired neurosurgeon who has surged to the top of the field of GOP hopefuls in Iowa, Clinton demurred.

“I'm going to leave that to the Republicans," she said. "If I say one or the other it might influence some people and I don't want to have any influence on it.”

Colbert, who became host of the “Late Show” in September, has interviewed several White House hopefuls, including Trump and former Florida Gov. Jeb Bush.

Clinton turned 68 on Monday and said that she spent the day with her husband, former President Clinton, and that the two binge-watched television.

"Bill and I watched bad TV, a little binge watching here and there,” she said, noting that they finished “House of Cards” and that her favorite shows include “Madam Secretary” and “The Good Wife" (both famously based on, or inspired by, aspects of her life).

As the two discussed the economy, Clinton began to tout a populist message of making it work for America’s families. Colbert noted it’s a standard line also used by her chief opponent for the party’s nomination, Vermont Sen. Bernie Sanders.

“We've got to get back to putting the middle class at the center of our politics,” she said, without mentioning Sanders’ name.