Question

8th grade > jj.8 use relative pronouns: who, whom, whose, which, and that khk
complete the sentence with the best relative pronoun.
scientists at stanford university are testing a tiny therapeutic implant device known as an \electroceutical,\ uses electrical stimulation to treat specific areas from within the body.

Explanation:

The relative - pronoun "which" is used to refer to things (in this case, the "electroceutical" device). "Who" and "whom" are used for people, and "whose" indicates possession. "That" can also be used for things, but in non - restrictive clauses (where a comma is used to separate the clause from the main sentence), "which" is more appropriate. Here, the clause following the device name is non - restrictive.

Answer:

which