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': 'Which of the following presents as mediastinal enlargement – \nSelect and explain. \nA. Promyelocytic Leukemia, B. CML, C. ALL, D. Diffuse histiocytic lymphoma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: "T cell variant of ALL presents with a wide mediastinal mass" - Ghai', 'role': 'assistant'}]