I tried to distinguish about MOSFET statement,,,
Just look at the datasheet.

(image source)
Here, I've drawn a line roughly separating the triode and linear regions. As you can see, the mode depends both on Vds and Vgs, so there's no way to tell from only one of these which mode it's in.
However, since you know that the drain current is 100 μA, knowing Vds alone is sufficient to know what mode it's in. At least, it would be if the datasheet graph went down that low; since it doesn't, the most you can do is make an educated guess. This isn't a FET designed for use at such low drain currents.

Note: Here, I'm assuming you meant the circuit you probably meant, which I've drawn below:



simulate this circuit &ndash; Schematic created using CircuitLab
If you actually meant what you drew, the answer would be very different--In the circuit you drew, Vo is always exactly -5 V.