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.

Example Input: Passage: During the Franco-Prussian War and the Siege of Strasbourg, the city was heavily bombarded by the Prussian army. The bombardment of the city was meant to break the morale of the people of Strasbourg. On 24 and 26 August 1870, the Museum of Fine Arts was destroyed by fire, as was the Municipal Library housed in the Gothic former Dominican church, with its unique collection of medieval manuscripts (most famously the Hortus deliciarum), rare Renaissance books, archeological finds and historical artifacts. The gothic cathedral was damaged as well as the medieval church of Temple Neuf, the theatre, the city hall, the court of justice and many houses. At the end of the siege 10,000 inhabitants were left without shelter; over 600 died, including 261 civilians, and 3200 were injured, including 1,100 civilians. Question: Who bombarded the city of Strasbourg? 
Example Output: Prussian army

Example Input: Passage: An electromagnetic wave refractor in some aperture antennas is a component which due to its shape and position functions to selectively delay or advance portions of the electromagnetic wavefront passing through it. The refractor alters the spatial characteristics of the wave on one side relative to the other side. It can, for instance, bring the wave to a focus or alter the wave front in other ways, generally in order to maximize the directivity of the antenna system. This is the radio equivalent of an optical lens. Question: What is used to allow one to control the function of wave fronts moving through an antenna?
Example Output: selectively delay

Example Input: Passage: British Prime Minister William Pitt's focus on the colonies for the 1758 campaign paid off with the taking of Louisbourg after French reinforcements were blocked by British naval victory in the Battle of Cartagena and in the successful capture of Fort Duquesne and Fort Frontenac. The British also continued the process of deporting the Acadian population with a wave of major operations against Île Saint-Jean (present-day Prince Edward Island), the St. John River valley, and the Petitcodiac River valley. The celebration of these successes was dampened by their embarrassing defeat in the Battle of Carillon (Ticonderoga), in which 4,000 French troops repulsed 16,000 British. Question: How did the British assure numerical superiority in taking Louisbourg?
Example Output:
French reinforcements were blocked by British naval victory in the Battle of Cartagena