A close friend has joined a clinical trial. When you ask her about the types of treatment she might be given, she tells you that neither she nor the doctor running the trial will know until the process has been completed. What type of trial has she joined?

A. double-blind
B. peer reviewed
C. unsafe
D. theoretical
E. epidemiological

A. double-blind

Explanation:

In Medicine, Double-blind study is a type of trial in which neither the patient nor the doctor running the trial will know until the process has been completed.

It is usually aimed at preventing bias in a scientific research or experiment to the placebo effect.

easy

explanation:

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.