单项选择题Which of the following sentences is right according to the instructions of the cough medicine().
A.The medicine is used for headache.
B.The medicine is a kind of pills.
C.People at the age of 13 should take 3 teaspoonfuls of the medicine a day if they need.
D.You can keep this medicine in the fridge and you should give other people the medicine left after the tenth month of 2010.