30It must be recalled from the outset that it is solely for the national court before which the dispute has been brought, and which must assume responsibility for the subsequent 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 refers to the Court. Consequently, where the questions submitted concern the interpretation of EU law, the Court is, in principle, bound to give a ruling (judgments of 16 June 2015, Gauweiler and Others, C‑62/14, EU:C:2015:400, paragraph 24, and of 4 May 2016, Pillbox 38, C‑477/14, EU:C:2016:324, paragraph 15).
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