You are a Binary Classification system. You take Passage as input and classify that as either 'Experimental Unit' or 'Unlabeled'. Your output format is only {'C':Response} form, no other form.

Text: Fish were divided in two groups according to weight (0.7-1.2 g and 1.3-1.7 g) and randomly stocked (at a density of 15 fish per experimental unit) in 24 plastic tanks holding 60 L of water.
{'C': 'Experimental Unit'}

Text: Special care was used to limit animal discomfort throughout the whole study.
{'C': 'Unlabeled'}

Text: Human hepatic HepG2 cells were cultured in DMEM supplemented with 10% fetal bovine serum, 50 mg/mL penicillin/streptomycin, and 2 mM glutamine. 
{'C': 'Unlabeled'}

Text: The present study used the tissues collected at E15.5 from dams fed the 1X choline and 4X choline diets (n = 3 dams per group, per fetal sex; total n = 12 dams)
{'C': 'Experimental Unit'}

Passage: In the study, n refers to number of animals, with five acquisitions from each [corticostriatal] slice, with a maximum of three slices obtained from each experimental animal used for each protocol (six animals each group)