The patients should be asked if they are ______.

A．most newly marketed drugs have side-effects
B．established drugs have serious effects
C．any unexpected effect of new drug is worth reporting
D．full reports should be sent of all the effects of all drugs

A．never to give drugs to people who have previously reacted badly
B．to protect himself by following the rules
C．to cut down the number of deaths due to drugs
D．to investigate whether the patient has a history of sensitivity to drugs