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

Here are some examples:
Text: Though recent effort in risk stratification and intensified chemotherapy and stem cell transplantation improved clinical outcome to a certain extent treatment resistance of MLL-ALL and MLL-AML has been one of the critical issues to be addressed.
{'C': 'Study Rationale'}

Text: Fortunately, the overall complete remission rate for childhood ALL has increased significantly in the last decades and has recently been reported as >95%
{'C': 'Unlabeled'}

Text: Our findings are supported by independent reports showing a pattern of DNA hypermethylation in high-risk non-metastatic and metastatic human cSCC.
{'C': 'Unlabeled'}

Text: There are currently no effective therapies for GM1 gangliosidosis and only symptomatic treatments are available.
{'C': 'Study Rationale'}

This is the end of the examples. Do not consider the examples as part of Passage.

Please classify this Passage.
Passage: Cavernous nerves (CN) injury-related erectile dysfunction (ED) was common in clinic, especially for those who have received radical prostatectomy (RP). Provide two versions of response separated with exactly 6 asterisk symbols: ******.
user