According to the following graph of activity as a function of pH, at which of the following pH values is the reaction that pepsin catalyzes the fastest? 
Definitions:
Hypertension
A medical condition characterized by persistently high blood pressure.
Blood Cholesterol
A fatty substance present in the blood, essential for normal body function but high levels can lead to cardiovascular diseases.
Renal Disease
A broad term representing disorders that affect the kidneys' ability to function properly, including conditions such as chronic kidney disease and glomerulonephritis.
Pulse Oximeter
A non-invasive device that measures the saturation of oxygen in a person's blood.
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