It is safest to conclude that after 40 years of research effort,the neurochemical bases of mood disorders

Question

Quizplus · Accepted Answer

While there has been significant research into the neurochemical bases of mood disorders over the last 40 years, a complete understanding of these disorders has not yet been achieved. While progress has been made, the causes and mechanisms behind mood disorders remain mysterious. Therefore, it is safest to conclude that the answer is D: remains mysterious.

It Is Safest to Conclude That After 40 Years of Research