Adventure question

Who is Jon Snow to Ned Stark?

"A" Biological Son

"B" Bastard

"C" ............

I selected "A" and it was wrong according to the developers. Now here is the thing. I myself have a half brother. He is my fathers Bastard son and he is also my fathers Biological son. So even though Jon Snow was Ned Starks bastard son he is still Ned Starks Biological son.

My ex calls me a bastard but I am not her biological son. hahaha