Problem: Extract the answer to the question from the following context. Question: How are LP's protected Context: Vinyl records can be warped by heat, improper storage, exposure to sunlight, or manufacturing defects such as excessively tight plastic shrinkwrap on the album cover. A small degree of warp was common, and allowing for it was part of the art of turntable and tonearm design. "wow" (once-per-revolution pitch variation) could result from warp, or from a spindle hole that was not precisely centered. Standard practice for LPs was to place the LP in a paper or plastic inner cover. This, if placed within the outer cardboard cover so that the opening was entirely within the outer cover, was said to reduce ingress of dust onto the record surface. Singles, with rare exceptions, had simple paper covers with no inner cover.

A: placed within the outer cardboard cover so that the opening was entirely within the outer cover

Problem: Extract the answer to the question from the following context. Question: Besides Sorry, what was a song not released by ABBA? Context: Her tenth studio album, Confessions on a Dance Floor, was released in November 2005. Musically the album was structured like a club set composed by a DJ. It was acclaimed by critics, with Keith Caulfield from Billboard commenting that the album was a "welcome return to form for the Queen of Pop." The album won a Grammy Award for Best Electronic/Dance Album. Confessions on a Dance Floor and its lead single, "Hung Up", went on to reach number one in 40 and 41 countries respectively, earning a place in Guinness World Records. The song contained a sample of ABBA's "Gimme! Gimme! Gimme! (A Man After Midnight)", only the second time that ABBA has allowed their work to be used. ABBA songwriter Bjorn Ulvaeus remarked "It is a wonderful track100 per cent solid pop music." "Sorry", the second single, became Madonna's twelfth number-one single in the UK.

A: Bjorn Ulvaeus

Problem: Extract the answer to the question from the following context. Question: What was the difficulty with delicate sounds and fine overtones? Context: Delicate sounds and fine overtones were mostly lost, because it took a lot of sound energy to vibrate the recording horn diaphragm and cutting mechanism. There were acoustic limitations due to mechanical resonances in both the recording and playback system. Some pictures of acoustic recording sessions show horns wrapped with tape to help mute these resonances. Even an acoustic recording played back electrically on modern equipment sounds like it was recorded through a horn, notwithstanding a reduction in distortion because of the modern playback. Toward the end of the acoustic era, there were many fine examples of recordings made with horns.

A: it took a lot of sound energy to vibrate the recording horn diaphragm and cutting mechanism

Problem: Extract the answer to the question from the following context. Question: Which of the following is a Christian figure: St. Peter, Bacchus, or the Julii? Context: With the building of Christian basilicas in the late 4th century, wall and ceiling mosaics were adopted for Christian uses. The earliest examples of Christian basilicas have not survived, but the mosaics of Santa Constanza and Santa Pudenziana, both from the 4th century, still exist. The winemaking putti in the ambulatory of Santa Constanza still follow the classical tradition in that they represent the feast of Bacchus, which symbolizes transformation or change, and are thus appropriate for a mausoleum, the original function of this building. In another great Constantinian basilica, the Church of the Nativity in Bethlehem the original mosaic floor with typical Roman geometric motifs is partially preserved. The so-called Tomb of the Julii, near the crypt beneath St Peter's Basilica, is a 4th-century vaulted tomb with wall and ceiling mosaics that are given Christian interpretations. The Rotunda of Galerius in Thessaloniki, converted into a Christian church during the course of the 4th century, was embellished with very high artistic quality mosaics. Only fragments survive of the original decoration, especially a band depicting saints with hands raised in prayer, in front of complex architectural fantasies.

A:
St Peter