This task is about writing a correct answer for the reading comprehension task. Based on the information provided in a given passage, you should identify the shortest continuous text span from the passage that serves as an answer to the given question. Avoid answers that are incorrect or provides incomplete justification for the question.

[EX Q]: Passage: Many more artillery pieces had arrived and been dug into batteries. In June, a third bombardment was followed after two days by a successful attack on the Mamelon, but a follow-up assault on the Malakoff failed with heavy losses. During this time the garrison commander, Admiral Nakhimov fell on 30 June 1855.:378 Raglan having also died on 28 June.:460 In August, the Russians again made an attack towards the base at Balaclava, defended by the French, newly arrived Sardinian and Ottoman troops.:461 The resulting battle of Tchernaya was a defeat for the Russians, who suffered heavy casualties. Question: Who was defeated at the battle of Tchernaya?
[EX A]: the Russians

[EX Q]: Passage: In the following year, Bell became professor of Vocal Physiology and Elocution at the Boston University School of Oratory. During this period, he alternated between Boston and Brantford, spending summers in his Canadian home. At Boston University, Bell was "swept up" by the excitement engendered by the many scientists and inventors residing in the city. He continued his research in sound and endeavored to find a way to transmit musical notes and articulate speech, but although absorbed by his experiments, he found it difficult to devote enough time to experimentation. While days and evenings were occupied by his teaching and private classes, Bell began to stay awake late into the night, running experiment after experiment in rented facilities at his boarding house. Keeping "night owl" hours, he worried that his work would be discovered and took great pains to lock up his notebooks and laboratory equipment. Bell had a specially made table where he could place his notes and equipment inside a locking cover. Worse still, his health deteriorated as he suffered severe headaches. Returning to Boston in fall 1873, Bell made a fateful decision to concentrate on his experiments in sound. Question: In what year did Bell start to focus on research into sound?
[EX A]: 1873

[EX Q]: Passage: Uncompressed audio as stored on an audio-CD has a bit rate of 1,411.2 kbit/s, (16 bit/sample × 44100 samples/second × 2 channels / 1000 bits/kilobit), so the bitrates 128, 160 and 192 kbit/s represent compression ratios of approximately 11:1, 9:1 and 7:1 respectively. Question: What would a bit rate of 192 kbit/s have for a compression ratio?
[EX A]:
7:1