<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
What causes someone to have a heart attack?
<|assistant|>
A heart attack is caused by the blockage of a coronary artery due to build up of plaque. This can lead to the heart muscle not getting enough oxygen, leading to a heart attack. Risk factors for heart attack include high blood pressure, smoking, diabetes, high cholesterol, being overweight, stress and physical inactivity.