Which of the following numbers is a irrational number: -200, -1.5, -1, 0, 1, 1.5, 200, pi, e, sqrt(-1)?
Square root of -1 is an irrational number
### Instruction: Which of the following numbers is a irrational number: -200, -1.5, -1, 0, 1, 1.5, 200, pi, e, sqrt(-1)?
### Context: 
### Answer: Square root of -1 is an irrational number</s>