question: childhood:life
choices.label: A B C D
choices.text: purified water:oxygen atoms preamble to the constitution:the constitution human:mammal administrative monopoly:monopoly
explanation: "childhood" is a part of "life", and "life" begins with "childhood". "oxygen atom" is part of "pure water", but the word order is inconsistent with the query. the "preamble to the constitution" is an integral part of the "constitution" and begins with the "preamble to the constitution". "humans" are a type of "mammals". "administrative monopoly" is a type of "monopoly".
relation: childhood life R2.3
relation: oxygen atoms purified water R2.3
relation: preamble to the constitution the constitution R2.3
relation: human mammal R2.2
relation: administrative monopoly monopoly R2.2