41In that regard, it should be recalled that, in proceedings under Article 267 TFEU, which are based on a clear separation of functions between the national courts and tribunals and the Court of Justice, any assessment of the facts in the case is a matter for the national court or tribunal. Similarly, it is solely for the national court or tribunal, before which the dispute has been brought and which must assume responsibility for the forthcoming judicial decision, to determine in the light of the particular circumstances of the case both the need for a preliminary ruling in order to enable it to deliver judgment and the relevance of the questions which it submits to the Court. Consequently, where the questions submitted concern the interpretation of European Union law, the Court is in principle bound to give a ruling (see, inter alia, Joined Cases C-261/08 and C-348/08 Zurita García and Choque Cabrera [2009] ECR I-10143, paragraph 34 and the case-law cited).
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