Final answer:
The method of asking a patient to expand on their symptoms using the question "Can you tell me more about your symptoms?" is categorized as open-ended questioning.
Step-by-step explanation:
Asking the patient "Can you tell me more about your symptoms?" is a method of collecting patient data known as open-ended questioning. This approach allows the patient to provide detailed, subjective information that can offer deeper insight into their condition. Unlike closed-ended questions that might only require a yes or no response, open-ended questions encourage a more expansive reply, providing qualitative data that are subjective and often based on what is seen in a natural setting.