In this task, you are given a question and a context passage. You have to answer the question based on the given passage.

[Q]: What do you need in addition to the LaserDisc in order to experience surround sound?, Context: Only one 5.1 surround sound option exists on a given LaserDisc (either Dolby Digital or DTS), so if surround sound is desired, the disc must be matched to the capabilities of the playback equipment (LD Player and Receiver/Decoder) by the purchaser. A fully capable LaserDisc playback system includes a newer LaserDisc player that is capable of playing digital tracks, has a digital optical output for digital PCM and DTS audio, is aware of AC-3 audio tracks, and has an AC-3 coaxial output; an external or internal AC-3 RF demodulator and AC-3 decoder; and a DTS decoder. Many 1990s A/V receivers combine the AC-3 decoder and DTS decoder logic, but an integrated AC-3 demodulator is rare both in LaserDisc players and in later A/V receivers.
[A]: playback equipment


[Q]: Who would Roncalli neglect  to spend his posthumous time with?, Context: His sister Ancilla would soon be diagnosed with stomach cancer in the early 1950s. Roncalli's last letter to her was dated on 8 November 1953 where he promised to visit her within the next week. He could not keep that promise, as Ancilla died on 11 November 1953 at the time when he was consecrating a new church in Venice. He attended her funeral back in his hometown. In his will around this time, he mentioned that he wished to be buried in the crypt of Saint Mark's in Venice with some of his predecessors rather than with the family in Sotto il Monte.
[A]: the family


[Q]: Why was it unclear that who was the original inventor?, Context: In the late 1980s, key breakthroughs in GaN epitaxial growth and p-type doping ushered in the modern era of GaN-based optoelectronic devices. Building upon this foundation, Dr. Moustakas at Boston University patented a method for producing high-brightness blue LEDs using a new two-step process. Two years later, in 1993, high-brightness blue LEDs were demonstrated again by Shuji Nakamura of Nichia Corporation using a gallium nitride growth process similar to Dr. Moustakas's. Both Dr. Moustakas and Mr. Nakamura were issued separate patents, which confused the issue of who was the original inventor (partly because although Dr. Moustakas invented his first, Dr. Nakamura filed first).[citation needed] This new development revolutionized LED lighting, making high-power blue light sources practical, leading to the development of technologies like BlueRay, as well as allowing the bright high resolution screens of modern tablets and phones.[citation needed]
[A]:
Both Dr. Moustakas and Mr. Nakamura were issued separate patents