Someone Has Recently Been Diagnosed with Major Depression That Puts

Someone has recently been diagnosed with major depression that puts her at risk for suicide. She has been prescribed several SSRIs over the past few months, but none seem to be working well. She should ask her doctor about _____, which is being tested as a rapid-acting antidepressant and is in trials for treating major depressive disorder.

A) clozapine
B) ketamine
C) L-dopa
D) barbiturates