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
Most specific test for organophosphorous poisoning is: 
Select and explain. 
A. RBC cholinesterase level, B. Plasma cholinestrase level, C. RBC uroporphyrin level, D. Measurment of serum level of organophosphorous
B: Plasma cholinestrase level
Answer: B: Plasma cholinestrase level 
Explanation: B i.e. Plasma cholinesterase level