Exploding head syndrome
Table:
Exploding head syndrome
Other names	Episodic cranial sensory shock,[1] snapping of the brain,[2] auditory sleep start[3]
Specialty	Sleep medicine
Symptoms	Hearing loud noises when falling asleep or waking up[2]
Duration	Short[2]
Causes	Unknown[3]
Differential diagnosis	Nocturnal epilepsy, hypnic headaches, nightmare disorder, PTSD[2]
Treatment	Reassurance, clomipramine, calcium channel blockers[2]
Prognosis	Good[2]
Frequency	~10% of people[2]

With reference to the table, determine whether the statement is entailed, neutral, or refuted. Return the result as JSON: {"answer": "YOUR ANSWER"}.

Claim: Exploding head syndrome has a short duration and the causes are unknown.

answer: neutral