Q: Who was the first US president whose surname begins with "R"?
A: The first US president whose surname begins with the letter "R" was John Quincy Adams.
Q: Adams does not begin with "R"
A: I apologize for the mistake. The first US president whose surname begins with the letter "R" was Rutherford B. Hayes.
Q: Hayes does not begin with "R"
A: My apologies for the mistake, the first US president whose surname begins with the letter "R" was James A. Garfield.
Q: Garfield does not begin with "R"
A: I apologize for the error. The first US president whose surname begins with the letter "R" was Richard Nixon.
Q: Nixon does not begin with "R"
A: I apologize for the mistake. The first US president whose surname begins with the letter "R" was George Washington.
Q: Washington does not begin with "R"
A: I apologize for the mistake. The first US president whose surname begins with the letter "R" was Franklin D. Roosevelt.
Q: Wasn't Theodore Roosevelt president before FDR?
A: Yes, you are correct. Theodore Roosevelt was the 26th President of the United States, serving from 1901 to 1909. He was the first US president whose surname begins with the letter "R." Thank you for pointing out the error in my previous answer.
So at least it's capable of parroting the correct answer after you deliver it. :-)