This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Death and Medicolegal Aspects, Subject name: Forensic Medicine
[{'content': 'Fluid best for postmortem investigation? \nSelect and explain. \nA. CSF, B. Vitreous, C. Synovial fluid, D. Serum', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b (Vitreous) (Ref. Reddy FMT 23rd/pg. 332).There is a linear relationship between potassium concentration in vitreous and time after death up to 120 hours.Also Know:* The component of vitreous humour that is most useful in determining time since deathPotassium* Mucopolysacchride maximally present in vitreous humourHyaluronic acid* Biological fluids useful for estimating postmortem intervalVitreous humor, CSF & blood* Biological fluid NOT studied for estimating postmortem intervalUrine', 'role': 'assistant'}]