The illiquidity is the biggest concern for options traders, especially when the option goes deep in the money or deep out of the money.
Since it is an American style option, you can exercise the option, and in this case would receive Rs. 9 for it.
If you hold it till expiry, you will be running the risk of the price bouncing back above the 90 level, in which case you may have to book a loss, or let the option expire worthless.