Obsessive-compulsive disorder
Table:
Obsessive–compulsive disorder

Frequent, excessive hand washing occurs in some people with OCD
Specialty	Psychiatry
Symptoms	Feel the need to check things repeatedly, perform certain routines repeatedly, have certain thoughts repeatedly[1]
Complications	Tics, anxiety disorder, suicide[2][3]
Usual onset	Before 35 years[1][2]
Causes	Unknown[1]
Risk factors	Child abuse, stress[2]
Diagnostic method	Based on the symptoms[2]
Differential diagnosis	Anxiety disorder, major depressive disorder, eating disorders, obsessive–compulsive personality disorder[2]
Treatment	Counseling, selective serotonin reuptake inhibitors, tricyclic antidepressants[4][5]
Frequency	2.3%[6]

Based on the table, identify if the claim is entailed, neutral, or refuted. Give your final answer in JSON format {"answer": "YOUR ANSWER"}.

Statement: OCD has known causes.

answer: refuted