The normal blood pressure of a healthy adult is
Explanation
ormal blood pressure of a healthy adult is In the human body, this option has the required identity, location, function, secretion, deficiency relationship, or disease association. 140/90 mmHg is incorrect because it refers to a different organ, substance, process, or medical association. 100/60 mmHg is also incorrect; it may be biologically important, but its principal role or defining feature is not the one being tested here. 160/100 mmHg is incorrect because its function, source, target, or disease relationship does not match the question. Decide whether it concerns anatomy, physiology, blood, hormones, vitamins, immunity, pathogens, or disease. Therefore option A, 120/80 mmHg, is factually consistent with the stem, the marked correct index, and the explanation. Normal blood pressure is 120/80 mmHg. Systolic (120) is pressure when heart beats; diastolic (80) when it rests.