Final answer:
A patient using natural herbs for pain management is practicing traditional medicine, which includes the use of natural resources and has informed some modern biomedical cures.
Step-by-step explanation:
A patient who is using natural herbs for pain management is practicing ethnomedicine, which falls under the category of traditional medicine (option b). This form of healthcare is rooted in cultural knowledge about managing health and treatments for illnesses, and it utilizes natural substances like herbs and foods that are often part of an ethnopharmacological tradition. Traditional medicinal practices, like those found in traditional Chinese medicine, are of great interest due to their potential for new biomedical cures. Many conventional medicines, like Bayer aspirin which was derived from willow bark historically used in various healing traditions, have origins in ethnomedicine.