Given a context passage, generate a question from the passage such that its answer is shortest continous span from the passage.

Ex Input:
The French Revolution broke out in 1789. At the time France was in a crisis. The government was badly run and people's lives were miserable. King Louis XIV tried to control the national parliament and raise more taxes. But his effort failed. He ordered his troops to Versailles. The people thought that Louis intended to put down the Revolution by force. On July 14, 1789, they stormed and took the Bastille, where political prisoners were kept. Ever since that day, July 14 has been the French National Day. Louis tried to flee the country in 1792, to get support from Austria and Prussia. However, he was caught and put in prison. In September 1792, the monarchy was abolished _ . In the same year, Louis was executed. A few months later his wife, Marie also had her head cut off. The Revolution of France had frightened the other kings of Europe. Armies from Austria and Prussia began to march against France. The French raised republican armies to defend the nation. The Revolution went through a period of terror. Thousands of people lost their lives. In the end, power passed to Napoleon Bonaparte.

Ex Output:
What's this passage about?

Ex Input:
A common challenge in pathogen discovery by deep sequencing approaches is to recognize viral or subviral pathogens in samples of diseased tissue that share no significant homology with a known pathogen. Here we report a homology-independent approach for discovering viroids, a distinct class of free circular RNA subviral pathogens that encode no protein and are known to infect plants only. Our approach involves analyzing the sequences of the total small RNAs of the infected plants obtained by deep sequencing with a unique computational algorithm, progressive filtering of overlapping small RNAs (PFOR). Viroid infection triggers production of viroid-derived overlapping siRNAs that cover the entire genome with high densities. PFOR retains viroid-specific siRNAs for genome assembly by progressively eliminating nonoverlapping small RNAs and those that overlap but cannot be assembled into a direct repeat RNA, which is synthesized from circular or multimeric repeated-sequence templates during viroid replication. We show that viroids from the two known families are readily identified and their full-length sequences assembled by PFOR from small RNAs sequenced from infected plants. PFOR analysis of a grapevine library further identified a viroid-like circular RNA 375 nt long that shared no significant sequence homology with known molecules and encoded active hammerhead ribozymes in RNAs of both plus and minus polarities, which presumably self-cleave to release monomer from multimeric replicative intermediates. A potential application of the homology-independent approach for viroid discovery in plant and animal species where RNA replication triggers the biogenesis of siRNAs is discussed.

Ex Output:
Which are the smallest known subviral pathogens of plants?

Ex Input:
Al-e Yusefi-ye Sofla (Persian: , also Romanized as Al-e Yusefi-ye Sofla; also known as Al-e Safi-ye Pa'in and Al-e Yusefi-ye Pa'in) is a village in Zirrah Rural District, Sadabad District, Dashtestan County, Bushehr Province, Iran.

Ex Output:
What is the name of Al-e Yusefi-ye Sofla's country?