[Q]: Information: - With reference to a given (possibly implicit) set of objects, a unique identifier (UID) is any identifier which is guaranteed to be unique among all identifiers used for those objects and for a specific purpose. There are three main types of unique identifiers, each corresponding to a different generation strategy: - A serial code is a unique identifier assigned incrementally or sequentially to an item . It is also called a serial number , although it may be a character string that includes letters and other typographical symbols , not just numerical digits . - An identifier is a name that identifies (that is, labels the identity of) either a unique object or a unique "class" of objects, where the "object" or class may be an idea, physical [countable] object (or class thereof), or physical [noncountable] substance (or class thereof). The abbreviation ID often refers to identity, identification (the process of identifying), or an identifier (that is, an instance of identification). An identifier may be a word, number, letter, symbol, or any combination of those. - A digit is a numeric symbol (such as "2" or "5") used in combinations (such as "25") to represent numbers (such as the number 25) in positional numeral systems. The name "digit" comes from the fact that the 10 digits (Latin "digiti" meaning fingers) of the hands correspond to the 10 symbols of the common base 10 numeral system, i.e. the decimal (ancient Latin adjective "decem" meaning ten) digits. Given the paragraphs above, decide what entity has the relation 'subclass of' with 'numeral'.
****
[A]: serial code

Problem: Information: - The Prime Minister of the Yemen Arab Republic was the head of government of that country in what is now northern Yemen . The Prime Minister was appointed by the President . There were twelve prime ministers of North Yemen . - Yemen ('), officially known as the Republic of Yemen ('), is an Arab country in Western Asia, occupying South Arabia, the southern end of the Arabian Peninsula. Yemen is the second-largest country in the peninsula, occupying 527,970km (203,850sqmi). The coastline stretches for about 2,000km (1,200mi). It is bordered by Saudi Arabia to the north, the Red Sea to the west, the Gulf of Aden and Arabian Sea to the south, and Oman to the east-northeast. Although Yemen's constitutionally stated capital is the city of Sana'a, the city has been under rebel control since February 2015. Because of this, Yemen's capital has been temporarily relocated to the port city of Aden, on the southern coast. Yemen's territory includes more than 200 islands; the largest of these is Socotra. - Socotra ('), also spelled Soqotra, is an island and a small archipelago of four islands in the Arabian Sea. The territory is part of Yemen, and had long been a subdivision of the Aden Governorate. In 2004, it became attached to the Hadhramaut Governorate, which is much closer to the island than Aden (although the nearest governorate was the Al Mahrah Governorate). In 2013, the archipelago became its own governorate, the Soqatra Governorate. - Sana'a (also spelled Sanaa or Sana; "" ) is the largest city in Yemen and the centre of Sana'a Governorate. The city is not part of the Governorate, but forms the separate administrative district of "Amanat Al-Asemah". Under the Yemeni constitution, Sana'a is the capital of the country, although the seat of the internationally recognised government moved to Aden in the aftermath of the 201415 Yemeni coup d'etat. Aden was declared as the temporary capital by President Abd Rabbuh Mansur Hadi in March 2015. - The People's Democratic Republic of Yemen ('), also referred to as South Yemen, Democratic Yemen or Yemen (Aden) a.k.a. South Arabian Federation, was a socialist state in the southern and eastern provinces of the present-day Republic of Yemen, including the island of Socotra. It united with the Yemen Arab Republic (commonly known as "North Yemen") on 22 May 1990, to form the present-day Yemen. After four years, however, South Yemen declared its secession from the north, which resulted in the north occupying south Yemen and the 1994 civil war. - The Red Sea (also the Erythraean Sea) is a seawater inlet of the Indian Ocean, lying between Africa and Asia. The connection to the ocean is in the south through the Bab el Mandeb strait and the Gulf of Aden. To the north lie the Sinai Peninsula, the Gulf of Aqaba, and the Gulf of Suez (leading to the Suez Canal). The Red Sea is a Global 200 ecoregion. The sea is underlain by the Red Sea Rift which is part of the Great Rift Valley. - The Yemen Arab Republic (YAR; '), also known as North Yemen or Yemen (Sana'a)"', was a country from 1962 to 1990 in the northwestern part of what is now Yemen. Its capital was at Sana'a. It united with the People's Democratic Republic of Yemen, commonly known as South Yemen, on May 22, 1990, to form the current Republic of Yemen. Given the paragraphs above, decide what entity has the relation 'dissolved or abolished' with '22 may 1990'.

A:
prime minister of yemen arab republic