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

In relation to hand hygiene; Which is the most effective option to reduce the risk of transmission of microorganisms, if the hands are not visibly dirty ?
En relación con la higiene de manos; ¿Cuál es la opción más eficaz para disminuir el riesgo de transmisión de microorganismos, si las manos no se encuentran visiblemente sucias?

Most of the filtered calcium is reabsorbed in
La mayor parte del calcio filtrado se reabsorbe en

The main donor of methyl groups in the body is

El principal donador de grupos metilo en el organismo es