Why Is Low-Cost Sequencing Important to Medicine,considering That the Human

Why is low-cost sequencing important to medicine,considering that the human genome project is considered complete?

A) The original sequence is now known to contain a high proportion of misassembled regions.
B) The original sequence is now known to contain a high proportion of errors.
C) The high mutation frequency of non-coding DNA means the project must be repeated every decade.
D) The original reference sequence captured almost none of the variations in humans.
E) Sanger sequencing has a lower error rate than next-generation sequencing.