You will be shown an abstract from a biomedical research paper. Given this abstract, your task is to extract all unique entities of the following types: ["Disease", "Chemical"].

Please return the output as a JSON object of the format: {"Chemical" : ["Naloxone", ...], "Disease" : ["Hypotensive", ...]}. The keys should be entity types and values should be lists of extracted entities belonging to the corresponding type. If you cannot find entities belonging to a specific type, the value should be [].

Only output the JSON object and do not include any additional text.

Abstract:

St. Anthony's fire, then and now: a case report and historical review. A rare case of morbid vasospasm, together with striking angiographic findings, is described secondary to the ingestion of methysergide by a 48-year-old woman. A brief review of the literature on similar cases is presented. A discussion of the history of ergot includes its original discovery, the epidemics of gangrene that it has caused through the ages and its past and present role in the management of migraine headache. Despite the advent of calcium channel blockers and beta-adrenergic antagonists, ergot preparations continue to play a major role in migraine therapy, so that the danger of St. Anthony's fire persists.
{"Chemical": ["calcium", "methysergide", "ergot"], "Disease": ["vasospasm", "migraine", "migraine headache", "St. Anthony\u0027s fire", "gangrene"]}