This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
In Hydrocephalus ex vacuo, the compensatory enlargement of ventricles and an increase in CSF volume due to brain atrophy is seen in- 
Select and explain. 
A. Alzheimers diseae, B. Picks diseases, C. Both, D. None of the above
C: Both
Answer: C: Both 
Explanation: Hydrocephalus ex vacuo

Insignificant cortical atrophy, there is compensatory ventricular enlargement secondary to loss of parenchyma → Hydrocephalus ex vacuo.
This can be seen in Alzheimer disease and Pick disease. - Anderson 10th/ep. 2740.