Final answer:
The patient's signalment is found in the History section of the medical record, providing critical information such as age, sex, breed, and reproductive status. This information is important for diagnosing and treating the patient.
Step-by-step explanation:
The section of the medical record that contains the patient's signalment is a) History. The signalment is a part of the patient’s history section and includes important identifying information such as age, sex, breed, and reproductive status. This section is crucial for providing context to the patient's health condition and is typically used in veterinary medicine. It helps the medical professional gain an initial understanding of the patient before more detailed assessments are conducted.