The conversation between human and AI assistant.
[|Human|] Which of the following numbers is a real number: -200, -1.5, -1, 0, 1, 1.5, 200, pi, e, sqrt(-1)?
[|AI|] The real numbers among those are -200, -1.5, -1, 0, 1, 1.5, 200, pi, e
[|Human|] 
Which of the following numbers is a real number: -200, -1.5, -1, 0, 1, 1.5, 200, pi, e, sqrt(-1)?