What is the antidote for benzodiazepines?

Flumazenil is the antidote specifically used for the reversal of benzodiazepine effects. It acts as a competitive antagonist at the benzodiazepine binding site of the GABA-A receptor. When administered, flumazenil competes with benzodiazepines for binding to these receptors, thereby reversing sedation and respiratory depression caused by benzodiazepine overdose.

Other options listed do not serve as antidotes for benzodiazepines. Naloxone is primarily used to reverse opioid overdoses, and pyridoxine (Vitamin B6) is used for certain types of poisoning but not for benzodiazepines. Sodium bicarbonate is used to treat metabolic acidosis and some drug overdoses, like tricyclic antidepressants, but it does not reverse benzodiazepine effects. Thus, flumazenil is the only correct answer for this particular scenario.