<|system|>
What is the greatest multiple of 99 that is less than 0?</s>.
<|user|>
Can you answer based on context?
<|assistant|>
This is a tricky question because we are dealing with negative numbers. In this case, the numbers that are closer to 0 are the greater numbers. So, the greatest multiple of 99 that is less than 0 would be $-99$.