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. Cloacal exstrophy, C. Exomphalos, D. Tracheo-oesophageal fistula', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Chromosomal trisomy', 'role': 'assistant'}]