313Moreover, as regards judicial review of whether the EU legislature has observed the principles of equal treatment and non-discrimination, the Court has held that that legislature has, in the exercise of the powers conferred on it, a broad discretion where it intervenes in a field involving political, economic and social choices and where it is called on to undertake complex assessments and evaluations. Thus, only if a measure adopted in this field is manifestly inappropriate in relation to the objectives which the EU legislature is seeking to pursue can the lawfulness of such a measure be affected (see, to that effect, judgment of 10 February 2022, OE (Habitual residence of a spouse – Nationality criterion), C‑522/20, EU:C:2022:87, paragraph 21 and the case-law cited). However, even where it has such a discretion, the EU legislature is obliged to base its choice on objective criteria appropriate to the aim pursued by the legislation in question, taking into account all the facts and the technical and scientific data available at the time of adoption of the act in question (see, to that effect, judgment of 16 December 2008, Arcelor Atlantique et Lorraine and Others, C‑127/07, EU:C:2008:728, paragraph 58).
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