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': 'Tissue biopsy for histopathological examination should be sent in: DNB 09 \nSelect and explain. \nA. Normal saline, B. Formalin, C. Rectified spirit, D. Saturated solution of saline', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Formalin', 'role': 'assistant'}]