In this task, you're given a question, along with a context passage which has extra information available on certain terms mentioned in it, i.e., the proper nouns in the passage. Your job is to determine whether information from more than one term is needed to answer the question. Indicate your choice as 'a' for Yes or 'b' for No.
Q: Question: When did the event after which Limerick was taken by Norman or Old English settlers begin? Passage:In times past, the ancient city of Limerick itself was entirely contained in the area now known as Englishtown as a walled city. The Vikings established the city in this area following the Viking Invasion of Ireland. After the Norman Invasion of Ireland, the city was taken by Norman or Old English settlers. It is from this time that the area became referred to as Englishtown and also to distinguish it from Irishtown south of the Abbey River which was populated by native Irish. It was during the Norman Conquest that many of the city's landmarks were built in this district such as the 13th century King John's Castle and the 800-year-old St Mary's Cathedral. Nicholas Street and Mary Street on the island formed the medieval city centre of Limerick and are perhaps the oldest streets in the city. Samuel Lewis writing in 1837 in his Topographical Dictionary of Ireland describes Limerick's old city of Englishtown as resembling the city of Rouen, Normandy with the housing built in Flemish fashion. Even by then though there is evidence the district was in decline as he describes the area as exhibiting a 'dirty & neglected appearance'. Following the development of Newtown Pery the city centre shifted south to the present day centre of the city and the Englishtown area lost its position as the fashionable area of the city. By the late 18th Century the old continental style cramped lofty Dutch & Flemish houses that once characterised the area were transformed into tenements and rented to Limerick's poorest. Englishtown became characterised by poverty, slum living and squalor. All of the slums were cleared in the early to mid 20th Century, resulting in the loss of most of the areas historical built heritage such as the collection of Flemish townhouses, Ireton's Castle, the Exchange building, the Tholsel amongst much more. Unfortunately many buildings and shops in the area remain derelict or in deteriorating conditions today.

A:
b