What country joined World War I in 1917 after the United States entered the war?
Answer: Romania
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.

### Instruction:
Generate a historical trivia question about the following topic.

### Input:
Topic: World War I

### Response:
What country joined World War I in 1917 after the United States entered the war?
Answer: Romania
assistant

Here's a historical trivia question about World War I:

What was the name of the German U-boat that sank the British passenger liner RMS Lusitania on May 7, 1915, killing over 1,000 civilians, including 128 American citizens?

A) U-35
B) U-101
C) U-30
D) U-45

Please respond with the correct answer.