Input: Article: Melbourne has the largest Greek-speaking population outside of Europe, a population comparable to some larger Greek cities like Larissa and Volos. Thessaloniki is Melbourne's Greek sister city. The Vietnamese surname Nguyen is the second most common in Melbourne's phone book after Smith. The city also features substantial Indian, Sri Lankan, and Malaysian-born communities, in addition to recent South African and Sudanese influxes. The cultural diversity is reflected in the city's restaurants that serve international cuisines.

Now answer this question: Which city in Greece is Melbourne's sister city?

Output: Thessaloniki

Input: Article: Penny Marshall's 1990 film Awakenings, which was nominated for several Oscars, is based on neurologist Oliver Sacks' 1973 account of his psychiatric patients at Beth Abraham Hospital in the Bronx who were paralyzed by a form of encephalitis but briefly responded to the drug L-dopa. Robin Williams played the physician; Robert De Niro was one of the patients who emerged from a catatonic (frozen) state. The home of Williams' character was shot not far from Sacks' actual City Island residence. A 1973 Yorkshire Television documentary and "A Kind of Alaska", a 1985 play by Harold Pinter, were also based on Sacks' book.

Now answer this question: Who wrote 'A Kind of Alaska'?

Output: Harold Pinter

Input: Article: LEDs have been developed by Seoul Semiconductor that can operate on AC power without the need for a DC converter. For each half-cycle, part of the LED emits light and part is dark, and this is reversed during the next half-cycle. The efficacy of this type of HP-LED is typically 40 lm/W. A large number of LED elements in series may be able to operate directly from line voltage. In 2009, Seoul Semiconductor released a high DC voltage LED, named as 'Acrich MJT', capable of being driven from AC power with a simple controlling circuit. The low-power dissipation of these LEDs affords them more flexibility than the original AC LED design.

Now answer this question: What is so good about ac powered HP-LEDs?

Output:
more flexibility