Problem: Extract the answer to the question from the following context. Question: What occurred that is in contrast to the amicable nature of the students? Context: 26 March 1991 is the day that marks the clash between military soldiers and peaceful demonstrating students which climaxed in the massacre of dozens under the orders of then President Moussa Traore. He and three associates were later tried and convicted and received the death sentence for their part in the decision-making of that day. Nowadays, the day is a national holiday in order to remember the tragic events and the people that were killed.[unreliable source?] The coup is remembered as Mali's March Revolution of 1991.

A: massacre

Problem: Extract the answer to the question from the following context. Question: What is the Dutchen word for oxen? Context: Voicing of pre-vocalic initial voiceless alveolar fricatives occurs, although less in Dutch than in German (Du zeven, Germ sieben [z] vs. Eng seven and LG seven [s]), and also the shift in // > /d/. Dutch shares only with Low German the development of /xs/ > /ss/ (Du vossen, ossen and LG Vosse, Ossen vs. Germ Fuchse, Ochsen and Eng foxes, oxen), and also the development of /ft/ /xt/ though it is far more common in Dutch (Du zacht and LG sacht vs. Germ sanft and Eng soft, but Du kracht vs. LG/Germ kraft and Eng cognate craft).

A: vossen

Problem: Extract the answer to the question from the following context. Question: What does an antenna in regard to resonance? Context: Resonant antennas are expected to be used around a particular resonant frequency; an antenna must therefore be built or ordered to match the frequency range of the intended application. A particular antenna design will present a particular feedpoint impedance. While this may affect the choice of an antenna, an antenna's impedance can also be adapted to the desired impedance level of a system using a matching network while maintaining the other characteristics (except for a possible loss of efficiency).

A: frequency

Problem: Extract the answer to the question from the following context. Question: Aruzi met a Doctor, a methematician, philosopher, and what is missing? Context: The study of the Quran and the Hadith thrived in such a scholarly atmosphere. Philosophy, Fiqh and theology (kalaam) were further developed, most noticeably by Avicenna and his opponents. Al-Razi and Al-Farabi had provided methodology and knowledge in medicine and philosophy. Avicenna had access to the great libraries of Balkh, Khwarezm, Gorgan, Rey, Isfahan and Hamadan. Various texts (such as the 'Ahd with Bahmanyar) show that he debated philosophical points with the greatest scholars of the time. Aruzi Samarqandi describes how before Avicenna left Khwarezm he had met Al-Biruni (a famous scientist and astronomer), Abu Nasr Iraqi (a renowned mathematician), Abu Sahl Masihi (a respected philosopher) and Abu al-Khayr Khammar (a great physician).

A:
a famous scientist and astronomer