Which among the following instruments used in Forensic Sciences is popular as Lie detector?

Q. Which among the following instruments used in Forensic Sciences is popular as Lie detector?
Answer: Polygraph
Notes: A polygraph is popularly known as a lie detector test. It is a device that measures and records several physiological indicators such as blood pressure, pulse, respiration, and skin conductivity while a person is asked and answers a series of questions.