)"Not only...but also" is the correct usage.
A and B can be eliminated for the use of 'patients' twice.
C is passive in "but also by time when the foods are eaten"
D changes the meaning.
E is the best choice.
A and B can be eliminated for the use of 'patients' twice.
C is passive in "but also by time when the foods are eaten"
D changes the meaning.
E is the best choice.












