Because of pain's complex nature, researchers have had to rely on all of these, EXCEPT:

Question

Quizplus · Accepted Answer

The statement says "researchers have had to rely on all of these, EXCEPT" which means the answer should be the option that researchers have not relied on. Therefore, the correct answer is D (objective measures) since researchers often struggle to find objective measures of pain and instead rely on subjective measures such as behavioral measures, pain diaries, and rating scales.

Because of Pain's Complex Nature, Researchers Have Had to Rely