Which of the following tests is also known as a lie detector test?

The correct choice is a polygraph test, known widely as a lie detector test. This test measures physiological responses such as heart rate, blood pressure, respiration, and skin conductivity while a person answers questions. The premise is that deceptive answers may produce physiological changes that can be detected by the polygraph machine.

By measuring these physiological responses, the polygraph aims to assess whether a person is being truthful or deceptive regarding specific questions. This method is often used in various settings, including criminal investigations and employment screenings, where a person's honesty is particularly crucial.

The other options refer to different tests: a skills test evaluates a person's specific abilities and competencies in a certain area; a performance test assesses how well an individual performs a task or job function; and a drug test screens for the presence of illegal substances in a person's system. Each of these tests serves a unique purpose and does not involve measuring deception or truthful responses in the way a polygraph does.