Task: Text Categorization
Input (English): Question: According to the Frank-Starling mechanism of the heart, under physiological conditions the cardiac output is directly proportional to: 
 Options:  <0> The size of the ventricle. <1> The heart rate <2> The venous return. <3> The thickness of the myocardium. <4> All the previous answers are correct.
Output (English): nursery