Which of the following best defines a "New problem with diagnostic workup"?

A. A diagnosis that is considered to be very plausible by the physician because of the findings, data, and information gathered about the presenting problem and the patient
B. A previously undiagnosed presenting problem that is unfamiliar to the physician and requires specific laboratory, pathology, or other diagnostic tests to identify the differential diagnosis
C. An undiagnosed new presenting problem that requires specific laboratory, pathology, or other diagnostic tests to identify the differential diagnosis
D. Intended to either prove that a specific diagnosis is the definitive diagnosis through diagnostic testing, data, and findings, or dismiss it from any future consideration as the final diagnosis of the presenting problem

B