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:

Leg and back pain after spinal anaesthesia involving hyperbaric 5% lignocaine. Fifty-four patients, aged 27-90 years, who were given lignocaine 5% in 6.8% glucose solution for spinal anaesthesia were studied. Thirteen of these patients experienced pain in the legs and/or back after recovery from anaesthesia. The patients affected were younger (p < 0.05) and the site of the dural puncture was higher (p < 0.01) than those individuals without pain. Five of the 13 patients (38%) with pain and seven of the 41 patients (17%) without pain admitted to a high alcohol intake, which might be a contributing factor. Leg and/or back pain is associated with the intrathecal use of hyperbaric 5% lignocaine.
{"Chemical": ["alcohol", "lignocaine", "glucose"], "Disease": ["Leg and back pain", "pain in the legs and/or back", "Leg and/or back pain", "pain"]}