Define the function get_rarest_potion that consumes a list of Potion and returns the label of the Potion that requires the most is_rare ingredients. If there are no rare ingredients in any of the potions, then return "N/A" instead. Do not define your own class here. Use the dataclasses that are already imported.

The file monster_mash.py is in monster_mash.py and in the monster_mash.py tab of the sandbox (To sandbox).