C (哦) 哦 o4
oh (that's why/ now I understand)
Interjektion, ach so, ich verstehe

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哦 哦 oh? really? is that so?

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from CC-CEDICT under a Creative Commons Attribution-Share Alike 3.0 License

哦' + 哦* * + to chant/
哦' + 哦* * + oh (interjection indicating doubt or surprise)/
哦' + 哦* * + oh (interjection indicating that one has just learned sth)/
哦' + 哦* * + sentence-final particle that conveys informality, warmth, friendliness or intimacy/ may also indicate that one is stating a fact that the other person is not aware of