Interactions Between the Body Systems and External Inputs Can Be

Interactions between the body systems and external inputs can be seen in the following situations, EXCEPT:

A) Use of low GI foods to control blood glucose concentrations.
B) Re-emergence of iodine deficiency partly due to the reduction in table salt use.
C) Enhancement of immune function with sunlight exposure.
D) Use of vitamin A acid (retinoic acid) for the treatment of acne.
E) Lower prevalence of depression in neighbourhoods with more walkability.