<prompt> True about the teratogenicity of a drug is all except:Characteristic set of malformations indicating selectivity for certain target organs is seenHeparin is highly teratogenic drugRelated to the dose of the teratogenic drugAffects specifically at a particular phase of development of the fetus  <response>: Teratogenjcity is the development of characteristic set of malformations by the use of a drug during pregnancy. Different drugs have specificity for a particular phase of development of fetus. The risk of teratogenesis is dose dependent. Heparin cannot cross the placenta and is thus safe during pregnancy. 