This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Labour - II, Subject name: Gynaecology & Obstetrics
An elderly multiparous women 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: The above history is suggestive of Amniotic fluid embolism Amniotic fluid embolism is a rare childbih emergency in which amniotic fluid enters the blood stream of the mother to trigger a serious reaction . This reaction then results in cardiorespiratory collapse It is suspected when a women giving bih experience very sudden respiratory disturbances , low blood pressure and profuse bleeding due to defect in blood coagulation.