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. 
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Question: Energy is created by burning either diesel or petrol in a combustion chamber. The energy is transferred from the pistons moving up and down at high speeds. This piston motion is converted to a rotary motion through the crankshaft and axle. The axle turns the wheels. The car moves forward. 

Answer: Describe how a car works


Question: Blood delivers oxygen in the body. Proteins and acids are broken down in the liver. The liver releases waste in the form of urea. The blood carries the urea and carbon dioxide to the kidneys. The kidneys strain the urea and salts needed from the blood. The carbon dioxide by product is transported back to the lungs. Carbon dioxide is exhaled by the lungs. 

Answer: How does blood remove waste from the human body?


Question: Food enters the body. The food is broken down. Sugars from the food enter the bloodstream. Blood sugar must be within a particular range to avoid damaging many organs. Sometimes the brain tells the pancreas the blood sugar (glucose) is too low. The pancreas releases glucagon to change the blood sugar to a better level. Sometimes the brain tells the pancreas the blood sugar (glucose) is too high. The pancreas releases insulin to change the blood sugar to a better level. 

Answer:
How does the body control its blood sugar level?