Which of the following is used to avoid bias in a clinical trial

A) Data manipulation

B) Unfair prejudice

C) Personal interest

D) Double-blind testing

Answer: Option d

Explanation: Whenever any clinical trail is conducted then the complete process is kept unbaised.

Double blind testing can be defined as an experiment in which neither the researcher nor the person who is getting placebo and who is getting treatment knows.

This is done in the clinical trials to keep the whole process unbaised.

d

Explanation:

double blind testing is your answer