Problem: What is the question to: "Sedimentary rocks are types of rock that are formed by the deposition of material at the Earth 's surface and within bodies of water."? The topic is Sedimentary rock.

A: "how does sedimentary rock form?"

Problem: What is the question to: "Section 8 of the Housing Act of 1937 (), often simply known as Section 8, as repeatedly amended, authorizes the payment of rental housing assistance to private landlords on behalf of approximately 3.1 million low-income households."? The topic is Section 8 (housing).

A: "what is section eight housing?"

Problem: What is the question to: "Kris Nathan Humphries (born February 6, 1985) is an American professional basketball player with the Brooklyn Nets ."? The topic is Kris Humphries.

A: "who does chris humphries play for?"

Problem: What is the question to: "It is normally involved in the metabolism of every cell of the human body, especially affecting DNA synthesis and regulation, but also fatty acid synthesis and energy production."? The topic is Vitamin B12.

A:
"what is vitamin b12 used for?"