This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Carcinoma Ovary, Subject name: Gynaecology & Obstetrics
[{'content': 'Most specific marker of neural tube defects is: \nSelect and explain. \nA. Alpha fetoprotein, B. Pseudocholinesterase, C. Acetylcholinesterase, D. Inhibin', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e. Acetylcholinesterase * NTD is suspected if the maternal serum AFP is elevated, and if the ultrasonographic examination is nondiagnostic, then amniotic fluid AFP levels are measured.* An elevated amniotic fluid AFP level prompts assay of the same sample for acetylcholinesterase. The presence of this enzyme 100% confirms that exposed neural tissue or another open fetal defect is present. AFP is not specific & is elevated in many conditions.", 'role': 'assistant'}]