What tool has a large pick and a large chisel or fork?

The tool that features a large pick and a large chisel or fork is known as the Kelly tool. This tool is specifically designed for firefighting and is especially effective in forcible entry situations. Its structure allows firefighters to pry open doors, reach into tight spaces, and manipulate materials at fire scenes. The pick end can penetrate materials, while the chisel or fork end is useful for prying or pulling apart objects.

The focus on these dual functionalities makes the Kelly tool indispensable for firefighters, as it enables them to tackle obstacles encountered while accessing structures or areas involved in a fire incident. This versatility and design feature truly set the Kelly tool apart, making it the correct answer in this context.