JUSTICE O'CONNOR delivered the opinion of the Court.
We granted certiorari in this case to determine whether the Court of Appeals for the District of Columbia Circuit correctly concluded that the Food and Drug Administration's longstanding interpretation of 21 U. S. C. § 346 was in conflict with the plain language of that provision. 474 U.S. 1018 (1985). We hold that, in light of the inherent ambiguity of the statutory provision and the reasonableness of the...
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