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:

Etiologic factors in the pathogenesis of liver tumors associated with oral contraceptives. Within the last several years, previously rare liver tumors have been seen in young women using oral contraceptive steroids. The Registry for Liver Tumors Associated with Oral Contraceptives at the University of California, Irvine, has clearly identified 27 cases. The recent literature contains 44 case reports. Common to these 71 cases has been a histopathologic diagnosis of focal nodular hyperplasia, adenoma, hamartoma, and hepatoma. Significant statistical etiologic factors include prolonged uninterrupted usage of oral contraceptive steroids. Eight deaths and liver rupture in 18 patients attest to the seriousness of this new potentially lethal adverse phenomenon.
{"Chemical": ["oral contraceptives", "Oral Contraceptives", "steroids", "oral contraceptive"], "Disease": ["hepatoma", "hamartoma", "Liver Tumors", "adenoma", "rupture", "focal nodular hyperplasia", "liver tumors"]}