+1 for A.
It is mentioned that siblings are 4 times more likely to suffer from classical migraines and spouses are similar to the general population here. Hence the classical migraines are linked to a hereditary problem.
Only A specifies that.
You can also reach to A by method of elimination.
It is mentioned that siblings are 4 times more likely to suffer from classical migraines and spouses are similar to the general population here. Hence the classical migraines are linked to a hereditary problem.
Only A specifies that.
You can also reach to A by method of elimination.
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