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  Section III
Questions 1 - 5:

Question 1
B
hydrochlorothiazide is a diuretic drug. Diuresis is the production of copious volumes of dilute urine

Question 2
B
"25% of patients taking a diuretic eventually also took an ACE inhibitor, and vice versa", hence 25% of the whole study took two drugs at some point

Question 3
A
ACE inhibitors inhibit the production of angiotensin II from angiotensin I.

Question 4
A
This would invalidate comparison as if the different studies used different types of diuretic then they are not controlled

Question 5
B
The major difficulty in treatment of hypertension is that it is multi-factoral

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