Input question: As what is an anti-pruritic drug used to act against?

Output answer: itching

Input question: What was famously built in 1961 and demolished in 1989?

Output answer: berlin wall

Input question: What annual three day event held near Stamford, Lincolnshire, England, was first organised by the 6th Marquess of Exeter in 1961?

Output answer: burghley horse trials

Input question: Which 1970's group recorded Stairway to Heaven?

Output answer:
led zeppelin