36Second, the alleged clarity of the answers to the questions referred in no way prevents a national court from making a reference for a preliminary ruling to this Court and does not have the effect of depriving this Court of jurisdiction to rule on such questions (see, to that effect, Joined Cases C-428/06 to C-434/06UGT-Rioja and Others [2008] ECR I-6747, paragraphs 42 and 43 and case-law cited).