When Tsar Nicholas II took over command of the army during WWI, who did he leave in charge of the government?

When Nicholas II left Petrograd in 1915 to take personal command of the Russian army, he left Tsarina Alexandra in charge of affairs at the capital. She relied heavily on Rasputin’s advice, but she—not Rasputin—was formally left in charge of the government. The correct choice is Tsarina Alexandra.

AI-written and checked against the verified answer.