<prompt> AVDRL reactive mother gave bih to an infant. All of the following would help in determining the risk of transmission to the infanct except -TPHA test on the serum sample of the motherTPHA test on the serum samle of the infantVDRL on the paired serum sample of the infant and motherTime interval between the treatment of the mother and her delivery  <response>: Ans. is b i.e., TPHA test on the serum sample of the infant 