Problem: Extract the answer to the question from the following context. Question: What does the outer part of the DNA form? Context: Two chains of DNA twist around each other to form a DNA double helix with the phosphate-sugar backbone spiralling around the outside, and the bases pointing inwards with adenine base pairing to thymine and guanine to cytosine. The specificity of base pairing occurs because adenine and thymine align form two hydrogen bonds, whereas cytosine and guanine form three hydrogen bonds. The two strands in a double helix must therefore be complementary, with their sequence of bases matching such that the adenines of one strand are paired with the thymines of the other strand, and so on.:4.1

A: backbone

Problem: Extract the answer to the question from the following context. Question: What did the people need who trusted the organization to have their best interests at heart? Context: UNFPA provided aid to Peru's reproductive health program in the mid-to-late '90s. When it was discovered a Peruvian program had been engaged in carrying out coercive sterilizations, UNFPA called for reforms and protocols to protect the rights of women seeking assistance. UNFPA was not involved in the scandal, but continued work with the country after the abuses had become public to help end the abuses and reform laws and practices.

A: assistance

Problem: Extract the answer to the question from the following context. Question: Which event occurred first, the conquest of the Dian Kingdom or the establishments of Xauntu Commandery? Context: From roughly 115 to 60 BC, Han forces fought the Xiongnu over control of the oasis city-states in the Tarim Basin. Han was eventually victorious and established the Protectorate of the Western Regions in 60 BC, which dealt with the region's defense and foreign affairs. The Han also expanded southward. The naval conquest of Nanyue in 111 BC expanded the Han realm into what are now modern Guangdong, Guangxi, and northern Vietnam. Yunnan was brought into the Han realm with the conquest of the Dian Kingdom in 109 BC, followed by parts of the Korean Peninsula with the colonial establishments of Xuantu Commandery and Lelang Commandery in 108 BC. In China's first known nationwide census taken in 2 AD, the population was registered as having 57,671,400 individuals in 12,366,470 households.

A: conquest of the Dian Kingdom

Problem: Extract the answer to the question from the following context. Question: A university is a place one can partake in? Context: Mahayana Buddhism flourished in India from the 5th century CE onwards, during the dynasty of the Guptas. Mahayana centres of learning were established, the most important one being the Nalanda University in north-eastern India.

A:
learning