It's story time!!

  Once Alibaba was cutting wood in a dense forest sitting on a tree. Suddenly he heard the sound of roaring truck. He climbed up the tree and saw a truck full of thieves fully loaded with money, gold and silver. The truck stopped in front of a small hillock. The chief thief got down the truck. At once a Robot appeared from no where like magic. It asked him a question and the thief answered it. Immediately a door opened in the hill and he saw a cave inside. The truck went inside and the door closed. After sometime the door opened and the truck went away. Alibaba understood the code for entry into the cave.

     Alibaba waited for sometime and he got down the tree and went near the hill. At once the Robot appeared and said the word COLOUR.  Alibaba replied THREE.  The door opened and he went inside with his mule. To his fascination,  he saw that the cave was dumped with loads of money, gold coins, jewellery and many valuables. He filled his bag with a reasonable amount of them and came near the door. The Robot again asked  him INDIGO. Alibaba replied THREE. The door opened.     

       He went to his village and distributed what he took among his poor friends and lived happily... ( Well the story does not end here..)
         His brother who was a greedy person envied Alibaba. So he followed him to the cave one day and hid behind the tree. The Robot this time asked VIOLET. Alibaba answered THREE and he went inside. Alibaba's brother went near the cave and heard what was happening inside. On his way out, the Robot asked BLUE and Alibaba answered TWO, the door opened and he came out with the loot.

          Alibaba's brother waited for him to go. Then he went near the cave. The Robot appeared and asked ORANGE  and he answered THREE. The door opened and he greedily went inside. He filled all his bags happily and came near the door. The Robot asked PINK. He answered TWO. But the door didn't open. Instead a cage fell around him and a huge rock started moving towards him from the ceiling. The Robot informed that he had 30 minutes time and if he answered the second question correctly,  he would be let out free. Otherwise he will be smashed down by the stone. He was then asked BLACK.
        Alibaba's brother could not guess the answer... well can you find the correct answer and help him get out of this danger? It is now in your hands to save his life... Can you save him!!