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: Pharmacology
[{'content': 'True about the teratogenicity of a drug is all except: \nSelect and explain. \nA. Characteristic set of malformations indicating selectivity for certain target organs is seen, B. Heparin is highly teratogenic drug, C. Related to the dose of the teratogenic drug, D. Affects specifically at a particular phase of development of the fetus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Teratogenjcity is the development of characteristic set of\xa0malformations by the use of a drug during pregnancy.\xa0Different drugs have specificity for a particular phase of\xa0development of fetus. The risk of teratogenesis is dose\xa0dependent. Heparin cannot cross the placenta and is thus\xa0safe during pregnancy.', 'role': 'assistant'}]