What strict guideline do all beers served at Oktoberfest adhere to?
A The Reinheitsgebot.
B The Munich Beer Code.
C The German Quality Assurance Law.
Fact: The Reinheitsgebot, or German Beer Purity Law, mandates that beer must be made with only water, barley, and hops, ensuring quality and tradition in the brewing process at Oktoberfest.
Correct Answer: The Reinheitsgebot.