(55)The conferral of supervisory tasks implies a significant responsibility for the ECB to safeguard financial stability in the Union, and to use its supervisory powers in the most effective and proportionate way. Any shift of supervisory powers from the Member State to the Union level should be balanced by appropriate transparency and accountability requirements. The ECB should therefore be accountable for the exercise of those tasks towards the European Parliament and the Council as democratically legitimised institutions representing the citizens of the Union and the Member States. That should include regular reporting, and responding to questions by the European Parliament in accordance with its Rules of Procedure, and by the euro Group in accordance with its procedures. Any reporting obligations should be subject to the relevant professional secrecy requirements.