While I was answeringanswering some grammar tests, I came across this :
(Blank) the patient's condition, the doctor decided to operate .
(Blank) the patient's condition, the doctor decided to operate .
Our teacher says 'regarding' is the correct choice but I can find no reason as to why 'according to' might be incorrect. PlzPlease explain the difference between 'regarding' and 'according to' ? Is it always possible to use these totwo interchangeably ?