instruction:
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.
question:
Passage: In September 1940 the first Alsatian resistance movement led by Marcel Weinum called La main noire (The black hand) was created. It was composed by a group of 25 young men aged from 14 to 18 years old who led several attacks against the German occupation. The actions culminated with the attack of the Gauleiter Robert Wagner, the highest commander of Alsace directly under the order of Hitler. In March 1942, Marcel Weinum was prosecuted by the Gestapo and sentenced to be beheaded at the age of 18 in April 1942 in Stuttgart, Germany. His last words will be: "If I have to die, I shall die but with a pure heart". From 1943 the city was bombarded by Allied aircraft. While the First World War had not notably damaged the city, Anglo-American bombing caused extensive destruction in raids of which at least one was allegedly carried out by mistake. In August 1944, several buildings in the Old Town were damaged by bombs, particularly the Palais Rohan, the Old Customs House (Ancienne Douane) and the Cathedral. On 23 November 1944, the city was officially liberated by the 2nd French Armoured Division under General Leclerc. He achieved the oath that he made with his soldiers, after the decisive Capture of Kufra. With the Oath of Kuffra, they swore to keep up the fight until the French flag flew over the Cathedral of Strasbourg. Question: Who led the first Alsatian resistance movement?  
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Marcel Weinum


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Passage: While Brazil was fighting the US through the WTO's Dispute Settlement Mechanism against a heavily subsidized cotton industry, a group of four least-developed African countries – Benin, Burkina Faso, Chad, and Mali – also known as "Cotton-4" have been the leading protagonist for the reduction of US cotton subsidies through negotiations. The four introduced a "Sectoral Initiative in Favour of Cotton", presented by Burkina Faso's President Blaise Compaoré during the Trade Negotiations Committee on 10 June 2003. Question: What are the African countries of Benin, Burkina Faso, Chad, and Mali referred to as in the cotton industry?
answer:
Cotton-4


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Passage: The lowest pressure that can be attained in a system is also dependent on many things other than the nature of the pumps. Multiple pumps may be connected in series, called stages, to achieve higher vacuums. The choice of seals, chamber geometry, materials, and pump-down procedures will all have an impact. Collectively, these are called vacuum technique. And sometimes, the final pressure is not the only relevant characteristic. Pumping systems differ in oil contamination, vibration, preferential pumping of certain gases, pump-down speeds, intermittent duty cycle, reliability, or tolerance to high leakage rates. Question: The choice of seals, or chamber geometry ,for example impact a pump. Together these are options are called what?
answer:

vacuum technique