This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urinary bladder, Subject name: Surgery
Which of the following statements about detrusor instability is false? 
Select and explain. 
A. 50 % of men with bladder outflow obstruction have detrusor instability, B. Patients with neurogenic bladder may have detrusor instability, C. Genuine stress incontinence (GSI) is indistinguishable from detrusor instability, D. Urodynamic studies are essential for evaluation of detrusor instability
C: Genuine stress incontinence (GSI) is indistinguishable from detrusor instability
Answer: C: Genuine stress incontinence (GSI) is indistinguishable from detrusor instability 
Explanation: Detrusor instability (DI) Detrusor instability caused by neurologic diseases such as cerebrovascualr disease, multiple sclerosis, or spinal cord injury is called detrusor hyperreflexia. Irritation of the bladder by inflammation (such as urinary tract infection) or prior pelvic surgery can also cause detrusor instability. Motor Urge Incontinence Symptomatic presentation is similar to sensory urge incontinence Diagnosis is usually suppoed by urodynamic findings of detrusor constrictions Can be associated with bladder outlet obstruction in men from (BPH) or anatomic stress incontinence in women. Can be idiopathic Also referred to as Detrusor instability Idiopathic detrusor instability can mimic GSI and may coexist. But they are different conditions that can be properly diagnosed by urodynamic studies.