During pregnancy baby can be affected in utero in all except:
Candida
Syphilis
Toxoplasmosis
Polio
In case of polio only feco-oral transmission is known, no placental transmission has been reported yet
All other disease mentioned may be transmitted to fetus by mother
I am in doubt about candida, because although congenital candidiasis can occur, the mode of transmission is not transplacental but ascending infection from external genitals of mother or during parturition.
But as far as the answer is concerned it is undoubtedly “POLIO”.