Lefties are at higher risk of ______.

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.

A．drugs are more effective to them
B．they have greater changes in electrical activity in the brain than righties
C．they are easier to get addicted to some drugs
D．more of them are treated for alcoholism