Which of the following is used to determine a person's DNA sequence?

Hormones are chemical messengers produced by glands in the endocrine system that regulate physiological processes in the body, such as growth, metabolism, and mood. While hormones can influence gene expression, they do not provide information about the DNA sequence itself. Therefore, hormones are unrelated to the determination of a DNA sequence.

Enzymes are biological catalysts that speed up chemical reactions in the body, including those involved in DNA replication and repair. Although some enzymes play a role in the processes that involve DNA, such as DNA polymerases in sequencing, they do not determine the sequence itself. Thus, enzymes are not the direct means of identifying a person's DNA sequence.

Blood types are classifications based on the presence of specific antigens on the surface of red blood cells. They are determined by certain genes but do not reflect the entire DNA sequence of an individual. Blood types provide information about immunological compatibility rather than a comprehensive understanding of a person's genetic information.