dubious to / dubious about

[Jeon54]

Hi,

dubious to/about...
I am wondering that which one is correct in this sentence.

'I am dubious to/about this fact.'

When I looked it up in an online dictionary,
I found out that the adjective 'dubious' was used with 'about'.

Is it wrong to use 'to' after dubious?

Please answer me!
Thanks.

[Our Tort System]

I'd say that "dubious about" is correct, and "dubious to" is wrong.
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