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': "Alpha feto protein is increased in all except \nSelect and explain. \nA. Chromosomal trisomy, B. Cloaca' exstrophy, C. Exomphalos, D. Tracheo-oesophageal fistula", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Chromosomal trisomy', 'role': 'assistant'}]