This question already has an answer here:
Frost Brand has this property:
When you hit with an attack using this magic sword, the target takes an extra 1d6 cold damage.
Since Jeremy Crawford states that the cold damage is part of its weapon damage dice, and Sneak Attack damage type is the same with its weapon damage, can I choose cold damage as the sneak attack damage?
Or must it be a mix of cold and slashing damage?