Final answer:
The patient-provider relationship is essential in medical practice, based on trust and communication, rather than a legal contract.
Explanation:
The statement that the patient-provider relationship is the keystone of medical practice but not necessarily contractual in nature is True.
While the doctor-patient relationship is crucial for quality healthcare, it is often based on trust, empathy, and communication rather than a legal contract.
This relationship is hierarchical, where the physician provides instructions and the patient is expected to follow them for effective treatment.
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