Which one is NOT an auto immune disease

A．mental diseases and disorders
B．speech deficiency
C．being excited
D．homicide

A．The right hand is controlled by the left side of the brain, and the left hand is controlled by the right side of the brain.
B．Right-handers' speech-language center is in brain' s left-hemisphere, while left-handers' speech-language center is in brain's right-hemisphere.
C．The development of right and left side of brain is interactive.
D．The human central nervous system is just like a circuit.