Question about I-485 form

My Son is applying for Green Card for me. My current status is a Visitor in the US.

I need to know what should I check for "Part 2: Application type" in the I-485 form? If the answer is g, what kind of explanation I need to give them?

Thanks in advance for your help..
 
The answer is "A" because you are an immidiate relative, assuming that either your son is a US citizen.
 
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