The answer would be CPT
The CPT code is used for procedure and service because it will be used as a reference to paying the health provider. The main difference with ICD-10 should be every CPT code will have a value of money. One diagnosis usually needs multiple procedures so the number of CPT code used in a patient tends to be more than ICD.
They are accepted as true until they are proven false. Once a theory has been tested and it is wrong, then it is no longer true.
Carbon atoms would be your answer.
Selective breeding is something only ascended organisms can adapt to. Us humans use selective breeding. Animals without complex language, artistic capabilities, etc, are unable to adapt to C.
D is your answer.