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: Pediatrics
[{'content': 'A 7 year old child with rheumatic heart disease presents with pallor, fever and a palpable spleen. The following investigations would be needed to arrive at a diagnosis except – \nSelect and explain. \nA. Electrocardiogram, B. Echocardiogram, C. Blood culture, D. Urine examination', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]