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': 'Premature baby of 34 weeks was delivered. Baby developed bullous lesion on the skin and X–ray shows periostitis. What should be the next investigation – \nSelect and explain. \nA. VDRL for mother & baby, B. ELISA for HIV, C. PCR for TB, D. Hepatitis surface antigen for mother', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]