A Mother of a School-Aged Child Asks the Pharmacist Why

A mother of a school-aged child asks the pharmacist why her child continues to have itching with no sign of mites. Which response by the pharmacist is the most appropriate?

A) "You will have to switch to something else besides lindane."
B) "Itching is common, even after the mites have been killed."
C) "The mites are too small to see, and treatment should be continued."
D) "Lindane usually works, but your child must need something stronger."