This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infant deaths & child abuse, Subject name: Forensic Medicine
[{'content': "Wredin's test is to demonstrate: \nSelect and explain. \nA. Live bih, B. Insanity, C. Putrefaction, D. Assault", 'role': 'user'}, {'content': "Answer: A \nExplanation: TESTS FOR LIVE BORN VS DEAD BORN :- Hydrostatic test :- Specific gravity of lungs decreases after respiration and respired lungs will float in water. Fodere's test :- Weight of Lungs increases due to increase in blood flow after respiration. Plocquet's test:- Ratio of the lung wt. to body wt. almost doubled after respiration. Wredin's test :- presence of air in middle ear after respiration. Breslau's second life test/stomach bowl test :- presence of swallowed air in the stomach /intestine after respiration.", 'role': 'assistant'}]