Q: Who has won the most Daytona 500 races?
What is the answer?

A: richard petty

Q: What word goes before tree, cart and pie
What is the answer?

A: apple

Q: On which river does Lisbon stand?
What is the answer?

A: tagus

Q: What rare form of headache whose name refers to its tendency to occur periodically has been called by some experts as the most painful condition known to medical science?
What is the answer?

A:
cluster headache