In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

Input: Consider Input: Passage: As the 19th century progressed, the United States government's Indian removal policy pushed Native American tribes west of the Mississippi River.  In 1830, the Indian Removal Act was signed into law, and though that act did not directly address the Potawatomi people of Indiana, it led to several additional treaties that resulted in their removal.  In what came to be known as the Potawatomi Trail of Death, about 860 Potawatomi Indians who had refused to leave were forced to move from Indiana to Kansas.  On September 14, 1838, the group camped near Williamsport, and on September 15 they camped in the southwestern part of the county before moving into Illinois.  Before reaching their destination in Kansas, over 40 of them had died, many of them children; two children died and were buried at the second Warren County campsite.When the county was established, the Wabash River was vital to transportation and shipping.  Zachariah Cicott traded up and down the river, and cities like Attica, Perrysville, Baltimore and Williamsport were founded near the river's banks and flourished because of it.  In the 1840s, the Wabash and Erie Canal began to operate and provided even broader shipping opportunities, but the canal favored towns which were on the "right side" of the river; the canal was on the Fountain County side, and towns like Baltimore dwindled as a result.  Some towns, such as Williamsport and Perrysville, managed to participate in canal traffic through the use of side-cuts that brought traffic from the canal across the river.  When railroads were constructed starting in the 1850s, they in turn began to render the canals obsolete and allowed trade to reach towns that lacked water connections.  The canal continued to be used through the early 1870s.

Output: What decade did the canals that provided broader shipping opportunities start to decline due to railroads?


Input: Consider Input: Passage: Ultrasonic tells the tale of Simon York – music teacher, married, soon to be father. Simon plays in a band and dreams of one day getting paid to write music. For now, however, money is tight and Simon shelling out $2000 to record an album is an additional cause of stress on his marriage to Ruth.
Jonas is Ruth's troubled brother and spends his days handing out flyers and trying to, "open peoples' eyes," to his theories of conspiracies and injustices in the world. One night Simon hears what he thinks is a very real sound in an alleyway. The sound does not disappear and remains audible from his house. Ruth doesn't hear it and she dismisses it, claiming that his ears are
ringing from years of loud music.
Jonas' reaction to Simon's ailment is much different than Ruth's. Jonas believes Simon and, after doing some research, believes that what Simon is hearing is in fact a government experiment, which utilizes an ultrasonic auditory signal to control the minds of all who hear it. Simon, with some prodding from Ruth, goes to visit an ear doctor who informs him that his test results show Simon's hearing to be least 6,000 Hz higher than the average human. This convinces Jonas that his theory is correct, and the two of them embark on a journey to get to the bottom of the sound experiment and stop the noise.

Output: Whose sister persuades the music teacher to have his ears checked?


Input: Consider Input: Passage: Unusual for a 13th-century Gothic cathedral, most of the windows are of clear glass.
Looking at the windows running along the nave, John L. Ward observed that the window directly above the suspended crucifix is the only one whose uppermost portion is visible. That window directly faces the viewer, revealing intricately designed stained glass panels that show intertwined red and blue flowers. Because the window is so far back in the pictorial space, where perspective is becoming faint, the proximity of the flowers to the crucifix lends them the appearance of coming "forward in space, as if [they] had suddenly grown from the top of the crucifix in front of it."Ward does not believe this a trick of the eye resulting from loss of perspective towards the high reaches of the panel. Instead he sees it as a subtle reference to the iconography and mythology of the Book of Genesis' Tree of life, which he describes here as "reborn in Christ's death". He does acknowledge the subtlety of the illusion, and the fact that neither of the two well known near copies include the motif. The idea of flowers shown as if sprouting from the top of the cross may have been borrowed from Masaccio's c. 1426 Crucifixion, where flowers are placed on the upper portion of the vertical beam of the cross. Ward concludes than van Eyck took the idea even further by showing the flowers emanating from another source, and sought to depict the actual moment where the tree of life is reborn and "the cross comes to life and sprouts flowers as one watches".


Output: What is the last name of the person who does acknowledge the subtlety of the illusion, and the fact that neither of the two well known near copies include the motif?