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: Gynaecology & Obstetrics
[{'content': 'Which of the following tests on maternal serum is most useful in distinguishing between open neural tube defects and ventral wall defects in tus? \nSelect and explain. \nA. Carcinoembryogenic antigen, B. Sphingomyelin, C. Alpha-feto protein, D. Pseudocholinesterase', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. is d i.e. Pseudochollnesterase', 'role': 'assistant'}]