In this task, you are given a sentence in the Spanish language. Your task is to translate the Spanish sentence into the English language.

[EX Q]: La valoración potenciométrica de cloruro con un electrodo de plata, empleando una disolución patrón de ion plata
[EX A]: Potentiometric titration of chloride with a silver electrode, using a silver ion standard solution

[EX Q]: La prevención primaria
[EX A]: Primary prevention

[EX Q]: El atenolol es un antihipertensivo β-antagonista que pertenece a la familia estructural
[EX A]:
Atenolol is an antihypertensive β-antagonist that belongs to the structural family