<prompt> 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?VDRL for mother babyELISA for HIVPCR for TBHepatitis surface antigen for mother  <response>: Bullous lesion and periostitis suggest the diagnosis of congenital syphilis. So, VDRL is done for mother baby 