Questions: A controllable risk factor for heart attack is: age genetics homocysteine inadequate exercise

The answer is the fourth one: inadequate exercise.

Explanation for each option:

1. Age: This is not a controllable risk factor. As people age, their risk of heart attack naturally increases, but age itself cannot be controlled or changed.

2. Genetics: This is also not a controllable risk factor. Genetic predisposition to heart disease is inherited and cannot be altered by lifestyle changes or interventions.

3. Homocysteine: While elevated levels of homocysteine in the blood can be a risk factor for heart disease, it is not directly controllable in the same way lifestyle factors are. However, it can be influenced by diet and medication, but it is not as straightforwardly controllable as exercise.

4. Inadequate exercise: This is a controllable risk factor. Individuals can choose to engage in regular physical activity to reduce their risk of heart attack. Exercise helps improve cardiovascular health and can mitigate other risk factors such as obesity, high blood pressure, and high cholesterol.

In summary, inadequate exercise is a controllable risk factor for heart attack, as individuals can take steps to increase their physical activity levels.