1. Pulmonary vein
  2. Pulmonary artery
  3. Coronary vein
  4. Coronary artery
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Option 4 : Coronary artery

A heart attack happens when the flow of oxygen-rich blood to a section of heart muscle suddenly becomes blocked and the heart can't get oxygen. It usually happens if the Coronary artery is blocked and can’t get oxygen supply.

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