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: Skin
A boy with multiple bullous lesions over trunk and periostitis on x-rays. What should be the next investigation 
Select and explain. 
A. VDRL of mother & child, B. PCR for maternal TB, C. HBsAg screening, D. ELISA of mother and Child
A: VDRL of mother & child
Answer: A: VDRL of mother & child 
Explanation: A i.e. VDRL of mother & child Vescobullous lesion with periostitisQ indicate congenital syphilis; so VDRL shoud be done.