Foreign institutional investors (FIIs) were net sellers of Rs 185.42 crore in the futures & options segment on Thursday.According to data released by the NSE, FIIs were net sellers of index futures to the tune of Rs 466.50 crore and bought index options worth Rs 892.78 crore. They were net sellers of stock futures to the tune of Rs 613.86 crore and bought stock options worth Rs 2.16 crore.