Final answer:
A potentially fatal complication of pregnancy caused by a blood clot obstructing the pulmonary artery is known as a Pulmonary embolism.
Step-by-step explanation:
Potentially Fatal Complication of Pregnancy Due to a Blood Clot
The correct answer to the question is A. Pulmonary embolism. This complication of pregnancy occurs when a blood clot, typically originating from a deep vein thrombosis (DVT), breaks off and travels through the bloodstream, lodging in the pulmonary artery and obstructing blood flow to the lungs. The pulmonary arteries are responsible for carrying deoxygenated blood from the heart to the lungs, where oxygenation occurs. A pulmonary embolism can therefore be life-threatening, disrupting the pulmonary circulation and potentially leading to severe consequences such as lung damage or sudden death.