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

Here are some examples:
Text: Bulls were blocked by BW into four blocks of 905 animals with similar BW and then within each block, bulls were randomly assigned to one of four experimental treatments in a completely randomized block design resulting in 905 animals per treatment. 
{'C': 'Minimization of Confounding Factors'}

Text: Test time was between 08.30am to 12.30pm and testing order was randomized daily, with each animal tested at a different time each test day.
{'C': 'Minimization of Confounding Factors'}

Text: Prior to the surgery, mice (N = 66) were anaesthetised (i.p.; fentanyl 0.05 mg/kg; midazolam 5 mg/kg; medetomidine 0.5 mg/kg) and, before any incision was made, the adequacy of anaesthesia was monitored by testing rear foot reflexes.
{'C': 'Unlabeled'}

Text:  On arrival from El-Nile Company, animals were assigned a group designation and weighed. A total number of 32 animals were divided into four different weight groups (eight animals per group). Each animal was assigned a temporary random number within the weight range group. On the basis of their position on the rack, cages were given a numerical designation. For each group, a cage was selected randomly from the pool of all cages. Two animals were removed from each weight range group and given their permanent numerical designation in the cages. Then, the cages were randomized within the exposure group.
{'C': 'Minimization of Confounding Factors'}

Text: Experimental tanks were maintained in a strict 14/10-h light/dark cycle environment (ZT0 = lights-on, ZT14 = lights-off) at 28 °C and animals were fed to satiety twice daily with dry food.
{'C': 'Unlabeled'}
This is the end of the examples. Do not consider the examples as part of Passage.

Please classify this Passage. 
Passage: After one week of acclimatisation, treatment with phenylhydrazine hydrochloride (PHZ, Sigma–Aldrich) was started to generate HF phenotype during five weeks. 