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: Surgery
[{'content': 'A Neonate is brought with history of not having passed meconium on examination there is no anal opening but a dimple. Investigation of choice is - \nSelect and explain. \nA. X-ray erect posture, B. X-ray supine posture, C. Gastrograffin study, D. Invertogram', 'role': 'user'}, {'content': 'Answer: D \nExplanation: • Anorectal malformations are associated with VACTERL abnormalities.', 'role': 'assistant'}]