This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
The regression between height and age follows y = a + bx. The curve is - 
Select and explain. 
A. Hyperbola, B. Sigmoid, C. Straight line, D. Parabola
C: Straight line
Answer: C: Straight line 
Explanation: None