Regarding Neurosurgery and Obsessive-Compulsive Disorder (OCD)

Regarding neurosurgery and obsessive-compulsive disorder (OCD) ,

A) ablation of the frontal cortex is most likely to produce improvement in OCD symptoms.
B) ablation of the cingulum bundle is most likely to produce negative cognitive changes in OCD patients.
C) neurosurgery works best when followed by drug treatment.
D) ablation of the cingulum bundle can lead to some improvement in OCD symptoms in about half of patients.
E) neurosurgery is the most common form of treatment for OCD.