This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Congenital Infections, Subject name: Pediatrics
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? 
Select and explain. 
A. VDRL for mother & baby, B. ELISA for HIV, C. PCR for TB, D. Hepatitis surface antigen for mother
A: VDRL for mother & baby
Answer: A: VDRL for mother & baby 
Explanation: Bullous lesion and periostitis suggest the diagnosis of congenital syphilis. So, VDRL is done for mother & baby