| List I (Parts of the brain) | List II (Functions) | ||
| 1 | Medulla oblongata | p | Body temperature |
| 2 | Hypothalamus | q | Olfaction |
| 3 | Cerebral cortex | r | Respiration |
| 4 | Limbic system | s | Motor function |
Match the following:
In the following, \( [x] \) denotes the greatest integer less than or equal to \( x \). 
Choose the correct answer from the options given below:
For x < 0:
f(x) = ex + ax
For x ≥ 0:
f(x) = b(x - 1)2