useless trivia: What Word Means: To Argue Against?

Questions

What do white blood cells produce to fight antigens?

In which country is the volcano Krakatoa?

What is the common name for the poisonous plant Atropa belladonna?

In which 1998 film does the lead character initially write a play entitled Romeo and Ethel the pirates daughter?

Which Eurovision song contest winning song was originally written for the Samaritans?