In this task, you are given a paragraph, and your task is to construct a question from the given passage. Construct question in such a way that (i) it is well explained in the paragraph, (ii) the words may/may not be present in the paragraph, (iii) it should start with what/how/describe. Avoid creating a question that (i) is just relevant to one or two sentences, and (ii) not relevant to passage. 

Ex Input:
You breathe in. Air goes through all the little branches in your lungs to fill up the air sacs, or alveoli. Oxygen goes through the walls of the alveoli and into the capillaries. The oxygen goes into the bloodstream. Oxygen is left and carbon dioxide is picked up. You breathe it out through your lungs. 

Ex Output:
How do the lungs work?


Ex Input:
Chemical reactions in the battery causes a build up of electrons at the anode. This results in an electrical difference between the anode and the cathode. The electrons wants to rearrange themselves to get rid of this difference. The electrons go to the cathode. Electricty is created. 

Ex Output:
How does does a battery produce electricity?


Ex Input:
You take some paper. The writing tools. You write a message describing what's on your mind. You put the letter into an envelope. You take the letter to the post office. Send it to its recipient. 

Ex Output:

Describe the process of writing and posting a letter