Ulcerative colitis
Table:
Ulcerative colitis

Endoscopic image of a colon affected by ulcerative colitis. The internal surface of the colon is blotchy and broken in places.
Specialty	Gastroenterology
Symptoms	Abdominal pain, diarrhea mixed with blood, weight loss, fever, anemia[1]
Complications	Megacolon, inflammation of the eye, joints, or liver, colon cancer[1][2]
Usual onset	15–30 years or > 60 years[1]
Duration	Long term[1]
Causes	Unknown[1]
Diagnostic method	Colonoscopy with tissue biopsies[1]
Differential diagnosis	Dysentery, Crohn's disease, ischemic colitis[3]
Treatment	Dietary changes, medication, surgery[1]
Medication	Sulfasalazine, mesalazine, steroids, immunosuppressants such as azathioprine, biological therapy[1]
Frequency	Up to 5 per 1000 people[4]
Deaths	47,400 together with Crohn's (2015)[5]

With reference to the table, determine whether the statement is entailed, neutral, or refuted. Output only the JSON object {"answer": "YOUR ANSWER"}.

Claim: Ulcerative colitis has no prevention methods.

answer: neutral