Final answer:
A pertinent negative would be illustrated by option C: "Nausea without vomiting."
Step-by-step explanation:
A pertinent negative would be illustrated by option C: "Nausea without vomiting." A pertinent negative is a symptom or sign that would be expected with a particular condition but is absent in the patient. In this case, experiencing nausea without vomiting is a relevant negative finding as vomiting is a common symptom associated with nausea.