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:

Brainstem dysgenesis in an infant prenatally exposed to cocaine. Many authors described the effects on the fetus of maternal cocaine abuse during pregnancy. Vasoconstriction appears to be the common mechanism of action leading to a wide range of fetal anomalies. We report on an infant with multiple cranial-nerve involvement attributable to brainstem dysgenesis, born to a cocaine-addicted mother.
{"Chemical": ["cocaine"], "Disease": ["cocaine-addicted", "fetal anomalies", "multiple cranial-nerve involvement", "brainstem dysgenesis", "cocaine abuse", "Brainstem dysgenesis"]}