In Chapter 4 of The End of Poverty, Professor Sachs outlines some lessons of clinical medicine that can be applied to Development Economics. Choose the correct lessons from below:(Download The End of Poverty Chapter 4 as a PD
F:)
选项：

A:The human body is a complex system.
B:Complexity requires a differential diagnosis.
C:All medicine is family medicine--social setting is crucial.
D:Medicine is a profession, and requires strong norms, ethics and codes of conduct.