The answer is A, the immune system
Meredith holds full responsibility for what happened to her patient. Falsifying documentation is illegal and extremely dangerous to the patients' health, as was the case with her patient, Mr. Wallace.
Meredith should have never put vitals down that were not taken at the time of the visit. What should have happened is that Meredith should have stopped attempting to take Mr. Wallace's vitals and asked a senior co-worker or the Physician to help assist with taking a blood pressure. She also could have used an alternate way of obtaining a blood pressure (example: using the radial pulse with the blood pressure cuff at the forearm). The patient should absolutely be reimbursed for the medical bills accrued from Meredith's mistake/lapse of judgment. Meredith also just receive a performance write-up with her employer. She is lucky if she would still have a job.
<span>Humans have an endoskeleton, whereas insects have exoskeletons.</span>
