Definition: In this task, you're given an article and an answer. Your task is to generate the fill-in-the-blank question for this answer based on the given article. The blanks are always at the end of the question, and can be filled with more than one word or phrase.
Input: Article: One morning, a young man leading a goat lost his way due to the thick mist.Then he met a blind man and asked whether he also lost his way.The blind man said, "I cannot see anything.Therefore, the mist doesn't affect me.I followed the path in my memory and it never goes wrong." Happily the young man led the goat following him forward.The blind man asked where he was going.He said he wanted to sell his goat."Male or female? How many years have you kept it?" The young man spoke without too much thought, "A female goat of 3 years!" The young man was still following the blind man when he was grasped the hand by the blind man.He shouted ,"Here is the police station! Go into it and _ on how you stole the goat!" The young man had been a thief for a long time and admitted the goat was stolen by him.He asked the blind man puzzlingly, "But how do you know I am a thief?" The blind man smiled, "I have been keeping goats for decades and can tell one of them is male or female as well as their age according to their voices.The goat you led just now is obviously a male goat, but you said female.The goat is simply a little more than one year old, but you said you had kept it for three years.Moreover, the goat will bleat totally differently when he is led by a stranger instead of his owner.So I can tell the goat does not belong to you!" Only then did the thief understand the whole thing with his head dropped down. 
 Answer: he couldn't see anything
