This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
An elderly multiparous woman with intrauterine foetal death was admitted with strong labour pains The patient suddenly goes in shock with cyanosis respiratory disturbances and pulmonary oedema The most likely clinical diagnosis is; 
Select and explain. 
A. Rupture of uterus, B. Congestive hea failure, C. Amniotic fluid embolism, D. Concealed accidental hemorrhage
C: Amniotic fluid embolism
Answer: C: Amniotic fluid embolism 
Explanation: <p> Amniotic fluid enter the maternal circulation and sets up a DIC,leading to consumptive coagulopathy. Classically a woman in late labour gasps for air,has bronchospasm,become cyanotic and undergoes immediate collapse and cardiorespiratory arrest,usually accompanied by hemorrhage. Reference: Textbook of obstetrics,Sheila Balakrishnan,2nd edition,page no;408 <\p>