A nurse would note that a patient had a good understanding of his antimalarial drug regimen if the patient reported, 

a. “I keep these pills with me at all times while I’m away and take them only when I have been bitten by a mosquito.” 

b. “I will need to start these pills now and then continue to take them every day for the rest of my life.” 

c. “I’ll start the pills before my trip, keep taking them during the trip, and for a period of time after I’m home.” 

d. “I start taking these pills as soon as I arrive at my vacation destination, but before I get off the plane.”