Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.
--------
Question: ayman al-zawahiri is a former member of islamist organizations which have organised and carried out attacks in north america, asia, africa and the middle east.

Answer: ayman al-zawahiri


Question: hadstock is a village and civil parish in uttlesford, essex, england.

Answer: hadstock


Question: dairy queen is an international chain of fast food restaurants started by john fremont mccullough on june 22, 1940 in joliet, illinois.

Answer:
dairy queen