Edison Format · March 2010
You choose whether to tribute or inflict damage with the ③ when it resolves, not when it activates.
The effect of "Volcanic Queen" starts a Chain during your End Phase. You choose to Tribute 1 other monster or take 1000 damage when the effect resolves.
If the effect of "Volcanic Queen" activates during the End Phase and "Remove Brainwashing" is chained, the player that controlled "Volcanic Queen" when its effect activated will Tribute 1 monster or take 1000 damage.