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:

Complete heart block following a single dose of trazodone. Forty minutes after receiving a single starting dose of trazodone, a patient developed complete heart block. The case illustrates that, despite the results of earlier studies, trazodone's effect on cardiac conduction may be severe in individuals at risk for conduction delay.
{"Chemical": ["trazodone"], "Disease": ["heart block"]}