what will you call it? soft drink? soda? or pop?

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I have come across so many term for the carbonated drinks...soft drink? soda? or pop? what is the universal agreement in the term the for the carbonated drinks? Of all the places I went, there call it differently....when to ask for the type of carbonated drinks in the restaurant...i don't know how should i refer it to....should just say what kind of carbonated drinks you have here? rather than asking what kind of soda you have? or soft drink you have? or pop you have? will be safe? what are your opinion on this?