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.

[Q]: Passage: Philadelphia has more public art than any other American city. In 1872, the Association for Public Art (formerly the Fairmount Park Art Association) was created, the first private association in the United States dedicated to integrating public art and urban planning. In 1959, lobbying by the Artists Equity Association helped create the Percent for Art ordinance, the first for a U.S. city. The program, which has funded more than 200 pieces of public art, is administered by the Philadelphia Office of Arts and Culture, the city's art agency. Question: Which American city has the most public art?
[A]: Philadelphia


[Q]: Passage: On 1 November 2013, international postal services for Somalia officially resumed. The Universal Postal Union is now assisting the Somali Postal Service to develop its capacity, including providing technical assistance and basic mail processing equipment. Question: What type of assistance does the postal union provide?
[A]: technical


[Q]: Passage: Zinc chloride is often added to lumber as a fire retardant and can be used as a wood preservative. It is also used to make other chemicals. Zinc methyl (Zn(CH3)
2) is used in a number of organic syntheses. Zinc sulfide (ZnS) is used in luminescent pigments such as on the hands of clocks, X-ray and television screens, and luminous paints. Crystals of ZnS are used in lasers that operate in the mid-infrared part of the spectrum. Zinc sulfate is a chemical in dyes and pigments. Zinc pyrithione is used in antifouling paints. Question: What is the feature of zinc sufide that makes it useful in television screens?
[A]:
luminescent pigments