Answer:
Option B, License
Step-by-step explanation:
In order to officially practice medicine, medical school students must pass a test to obtain license.
Specifically, these students -- presumably in the US -- must pass the United States Medical Licensing Examination, or USMLE for short, if they are a doctor of medicine (MD) or the Comprehensive Osteopathic Medical Licensing Examination of the United States, or COMLEX-USA, if they are a doctor of osteopathic medicine (DO). These two standardized tests determine if a student has attained the knowledge necessary for licensure federally, however, each state may have additional requirements of their own.
The medical degree is obtained by attending an accredited institution that offers an MD or DO program. Technically, students must pass a test in order to obtain a degree as well to then practice medicine because they must pass the Medical College Admissions Test (MCAT) in order to begin their programs, and without a degree you cannot obtain a license to practice medicine. However, this is not the best answer available.
Residency is the postgraduate training that takes place following the physician obtaining their license. Specialty is the specific field of medicine a resident may train in under an experienced physician when exploring their niche in the healthcare realm.
Therefore, medical school students wishing to practice medicine must pass a test before they can obtain a license.