Pointing to a photograph, X said, 'She is the only daughter of the father of my mother.'
How is X related to the person?
I. Daughter
II. Son
III. Nephew
IV. Cannot be decided

Question: 以下哪项是正确的？
Options:
A. 仅 II, B. 仅 III, C. 以上各项均不成立, D. IV 或 I, E. 仅 I
Answer: A
True statement: II