No history of trauma or fever. What is the most likely diagnosis of this patient?

A patient with history of alzheimers dementia have now started with dis inhibitions and
inappropriate behavior like peeing in the pot in the mall and other similar things. No history of trauma
or fever. What is the most likely diagnosis of this patient?
A. UTI
B. Worsening of dementia
C. Subdural hematoma
D. Secondary Depression

Typical question of fat embolism with long bones fracture and SOB on 3 rd day with confusion and
chest petechiae and Xray showing diffuse broncho vascular markings. What is the best modality of
investigation for proper diagnosis of this patient?
A. CTPA – fat embolism
B. VA QC
C. D Dimer