Input question: What name is given to the enclosed courtyard of a medieval castle?

Output answer: bailey

Input question: In the human body, Skeletal, Smooth and Cardiac are all types of what?

Output answer: muscle

Input question: What substance in the human body causes blood vessels to dilate when released as part of an allergic reaction?

Output answer: histamine

Input question: During which century was Sir Walter Scott born?

Output answer:
18th