Complete the passage on hypertension by choosing the correct options from those given below.
There are two kinds of hypertension : secondary and primary. Secondary hypertension has organic causes. It (a) ...................be caused by either obstructive kidney **, tumour of the brain, thyroid or adrenal glands (b) .................... narrowing of the aorta. It is more common (c) ... ........... younger people and surgery usually (d) .. .. ............ the pressure to normal levels. Primary hypertension, is a silent *****. It shows no obvious symptoms (e) . ................ it is well advanced.
