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:

Persistent nephrogenic diabetes insipidus following lithium therapy. We report the case of a patient who developed severe hypernatraemic dehydration following a head injury. Ten years previously he had been diagnosed to have lithium-induced nephrogenic diabetes insipidus, and lithium therapy had been discontinued. He remained thirsty and polyuric despite cessation of lithium and investigations on admission showed him to have normal osmoregulated thirst and vasopressin secretion, with clear evidence of nephrogenic diabetes insipidus. Lithium induced nephrogenic diabetes insipidus is considered to be reversible on cessation of therapy but polyuria persisted in this patient for ten years after lithium was stopped. We discuss the possible renal mechanisms and the implications for management of patients with lithium-induced nephrogenic diabetes insipidus.
{"Chemical": ["Lithium", "lithium", "vasopressin"], "Disease": ["dehydration", "polyuric", "nephrogenic diabetes insipidus", "polyuria", "head injury"]}