This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pharmacology, Subject name: Pharmacology
Which of the following statements regarding transfer of drugs across placenta is FALSE? 
Select and explain. 
A. Transfer across placenta is lesser in early pregnancy, B. most of the drugs to some extent can cross the placenta except heparin and insulin, C. drugs most commonly transfers through active transpo, D. P-glycoprotein is present in placenta
C: drugs most commonly transfers through active transpo
Answer: C: drugs most commonly transfers through active transpo 
Explanation: <Insulin and heparin(strongest acid) are very high molecular weight drugs- cant cross through the placenta. lipid soluble and unionized drugs easily pass through the placenta drugs mostly common transfer through passive diffusion.P glycoprotein plays a key role in the transfer of drugs Pg.no.19 K D Tripathi Seventh edition