Problem: Sino-Tibetan relations during the Ming dynasty:

In order to seek out the Karmapa, the Yongle Emperor dispatched his eunuch Hou Xian and the Buddhist monk Zhi Guang (d. 1435) to Tibet. Traveling to Lhasa either through Qinghai or via the Silk Road to Khotan, Hou Xian and Zhi Guang did not return to Nanjing until 1407.

Who did the Yongle Emperor send to Tibet?
---
A: Hou Xian and the Buddhist monk Zhi Guang

Problem: A P-N junction can convert absorbed light energy into a proportional electric current. The same process is reversed here (i.e. the P-N junction emits light when electrical energy is applied to it). This phenomenon is generally called electroluminescence, which can be defined as the emission of light from a semi-conductor under the influence of an electric field. The charge carriers recombine in a forward-biased P-N junction as the electrons cross from the N-region and recombine with the holes existing in the P-region. Free electrons are in the conduction band of energy levels, while holes are in the valence energy band. Thus the energy level of the holes will be lesser than the energy levels of the electrons. Some portion of the energy must be dissipated in order to recombine the electrons and the holes. This energy is emitted in the form of heat and light.
Whose energy levels are lower than the non-electrons in the electroluminescence process?
---
Answer: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The 10th century saw a mass migration of Turkic tribes from Central Asia into the Iranian plateau. Turkic tribesmen were first used in the Abbasid army as mamluks (slave-warriors), replacing Iranian and Arab elements within the army. As a result, the mamluks gained a significant political power. In 999, large portions of Iran came briefly under the rule of the Ghaznavids, whose rulers were of mamluk Turk origin, and longer subsequently under the Turkish Seljuk and Khwarezmian empires. These Turks had been Persianized and had adopted Persian models of administration and rulership. The Seljuks subsequently gave rise to the Sultanate of Rum in Anatolia, while taking their thoroughly Persianized identity with them. The result of the adoption and patronage of Persian culture by Turkish rulers was the development of a distinct Turko-Persian tradition.
The Abbasid army replaced Iranian and Arabic men with Turkic tribesmen as what element in their army?
A: mamluks (slave-warriors)

Context and question: The Raleigh Parks and Recreation Department offers a wide variety of leisure opportunities at more than 150 sites throughout the city, which include: 8,100 acres (33 km2) of park land, 78 miles (126 km) of greenway, 22 community centers, a BMX championship-caliber race track, 112 tennis courts among 25 locations, 5 public lakes, and 8 public aquatic facilities. The J. C. Raulston Arboretum, an 8-acre (32,000 m) arboretum and botanical garden in west Raleigh administered by North Carolina State University, maintains a year-round collection that is open daily to the public without charge.
How many public lakes are in Raleigh?
Answer: 5 public lakes,

Question: The oldest brain to have been discovered was in Armenia in the Areni-1 cave complex. The brain, estimated to be over 5,000 years old, was found in the skull of a 12 to 14-year-old girl. Although the brains were shriveled, they were well preserved due to the climate found inside the cave.
Is there an answer to this question: The oldest brain found in a cave was from what gender of human?

Answer: girl

Madonna moved in with boyfriend John "Jellybean" Benitez, asking his help for finishing the album's production. Benitez remixed most of the tracks and produced "Holiday", which was her third single and her first global hit. The overall sound of Madonna was dissonant and in the form of upbeat synthetic disco, using some of the new technology of the time, like the Linn drum machine, Moog bass and the OB-X synthesizer. The album was released in July 1983 and peaked at number eight on the Billboard 200 six months later, in 1984. It yielded two more hit singles, "Borderline" and "Lucky Star".
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Who remixed most of Madonna's album tracks?
Ah, so..
Benitez