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'Okay' as an agreement is d'accord. To say that you are okay if someone asks you how you are, you could say 'comme ci, comme ca.'
Okay, please see my last answer above
Okay, that is also likely from acid reflux
Okay, then she may try a drug called Buspirone, it works well for the symptoms she has
Okay, then you may need to switch medication to lansoprazole instead of nexium, and dilaudid for pain