```json
{
	"no": ["N"],
	"yes": ["Y"]
}
```
Based on prior knowledge, exercise-induced angina (ExerciseAngina) is a categorical variable with two possible categories: "N" (no) and "Y" (yes). In the context of coronary angiography, the presence of exercise-induced angina can be indicative of heart disease. Therefore, the presence of exercise-induced angina (category "Y") would suggest that the coronary angiography of the patient shows a heart disease ("yes" in the task). Conversely, the absence of exercise-induced angina (category "N") would indicate no heart disease ("no" in the task).