ANS:B - cobalt, chromium & tungsten.

The constituents of Stellite alloy typically include cobalt, chromium, and tungsten. Stellite is a family of alloys that are known for their excellent wear resistance, high temperature resistance, and corrosion resistance. These alloys are commonly used in applications such as cutting tools, valve seats, and high-temperature bearings due to their exceptional properties. Therefore, the correct option is: cobalt, chromium & tungsten.