Title: Race (human categorization).
Question: What is a problematic category in addition to race?

Title: Jehovah%27s Witnesses.
Question: Whose pronouncements within Jehovah Witnesses group are considered to carry almost as much weight as the Bible?

Title: Germans.
Question: When did Austria and Prussia go to war?

Title: Classical music.
Question:
What time period is known at the common practice period?