What is the most likely cause of an allergic reaction red meat root veg or cashew nuts?

The most likely cause of an allergic reaction among the options provided is cashew nuts. Nut Allergies, particularly to tree nuts like cashews, are common and can trigger severe allergic responses. Red meat and root vegetables can also cause allergies, but they are less frequent compared to nut allergies. If someone has a known allergy to cashews, consuming them can lead to immediate and serious reactions.