The stage of the heart cycle in which the heart muscle is relaxed<span>, allowing the chambers to fill with blood. ... The </span>stage of the heart cycle in which the heart muscle<span> contracts and the chambers pump blood. Systolic Pressure. Blood pressure in the arteries during contraction of the ventricles</span>
B
Although D describes some time "Type" of medicines, B would better fit because the question asks how can medicine be described.
-Medical Student (College Level)
