This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Forensic Medicine
[{'content': "Raygat's test is used for ? \nSelect and explain. \nA. Weight of lung, B. Specific gravity of lung, C. Consistency of lung, D. None", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is \'b\' i.e., Specific gravity of lung Hydrostatic test (Raygat\'s test, 1" life test) : The specific gravity of a non-respired lung is 1040-1050 and of a respired lung is 940-950, so, after respiration lung floats on water (specific gravity of water is 1000). False positive hydrostatic test may occur (i.e.non-respired lung may float) in decomposition and in attempted aificial respiration. False negative hydrostatic test (i.e. respired lung may sink down) may occur in atelectasis, pulmonary oedema, bronchopneumonia, and congenital syphylis.', 'role': 'assistant'}]