I need answer for this question : Which of these U.S. Presidents had no biological children? Correct

What would you add to a Martini to make it a Dirty Martini? Answer
What would you add to a Martini to make it a Dirty Martini? Correct
What would you add to a Martini to make it a Dirty Martini? Explained
What would you add to a Martini to make it a Dirty Martini?
What type of mustache did Charlie Chaplin wear? Answer
What type of mustache did Charlie Chaplin wear? Explained
What type of mustache did Charlie Chaplin wear? Correct
What type of mustache did Charlie Chaplin wear?
“Go Set a Watchman” was the 2015 follow-up book to what literary classic? Explained
“Go Set a Watchman” was the 2015 follow-up book to what literary classic? Answer