Use of 'Precision' as an Approach to Medical or Nutritional

Use of 'precision' as an approach to medical or nutritional practice is demonstrated by the following scenarios, EXCEPT:

A) Identifying suitable doses (which could be more or less than routinely prescribed) of medications for those with genetic variations.
B) Identifying the best treatment for cancer in each individual patient dependent on genetic profile.
C) Use of yoghurts containing specific live cultures to restore general homeostasis through the gut microbiota.
D) Identifying the most suitable dietary patterns to reduce the risk of Alzheimer's disease in those with the ApoE genotypic allele ԑ4.
E) Growing replacement organs from the patient's own cells.