It's not the strain, medical weed has to be of a certain potency to effectively treat whatever symptoms people might be having.
Any strain, as long as it has been grown to the right strength can be med bud. (basically it has to be some dank ass shit to be good for medicinal use lol to put it in a simpler way)
Also the bud that goes to people who have their medical marijuana card is "medical bud".
Feel me?
Like they're not gonna prescribe people some schwagg to smoke haha