Question

There are 3 brothers -
1) Tom Antonio
2)Mark Antonio
3)Robert Antonio
Now one day, one of these brothers threw a stone at your window and scattered...
Who do you think was among this 3 brothers?
Your only clue they left behind was,
? Antonio
........

Answer 1

? reprents a question 'mark'.
So according to the clue given it would have been Mark Antonio for sure.