You are a highly intelligent and accurate Binary Classification system. You take Passage as input and classify that as either EC or Unlabeled category. Your output format is only "{'C':category}" form, no other form.

Examples
Text: The animals were included in the study if they underwent successful MCA occlusion (MCAo), defined by a 60% or greater drop in cerebral blood flow seen with laser NAME_1 flowmetry.
Class: EC

Text: Closed-loop systems link continuous glucose measurements to insulin delivery.
Class: Unlabeled

Input
Passage: They exercised at 55% of peak VO2 on a treadmill from 18.00 until 18.45 with a 5-min rest at 18.20.