In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

Question: What phase is pure chlorine present as? Answer: gas
Gas phase is pure chlorine present as.

Question: During which phase does dna replication occur in the cell cycle? Answer: synthesis
During the synthesis phase in the cell cycle, dna replication occurs.

Question: Most of the gray matter is on the surface of the brain, surrounding what other type of matter? Answer: white
Most of the gray matter is on the surface of the brain, surrounding white matter.