Task: Question Answering
Input (English): Passage: When you go out , to school , the store , or to work , the last thing you want to find when you come home is that someone has been in your house ! This is why I always take safety precautions , and today was no different . Before I left , I made sure that all of my windows were closed tight and locked , so that no one could open them from the outside . I was also sure to lock the back door . I made sure to lock both . Now I 'm ready to leave ! The last step when leaving the house and walking out the front door , is to make sure I have my keys in my hand , so I do n't get locked out , of course . I can lock the handle on the door knob from the inside , and then use my keys to lock the dead bolt from the outside . This makes extra sure no one will be able to enter my house without my permission , and I 'm ready to go out into the world with peace of mind . Question: What is the lock on the top for? Option1: to deadbolt the door Option2: To have extra keys.
Output (English): to deadbolt the door