单项选择题

Medicine Directions
Take two tablets with warm water, followed by one tablet every eight hours, as required. For maximum nighttime and early morning relief, take two tablets at bedtime. Do not exceed six tablets in twenty-four hours.
For children six to twelve years old, give half the adult dosage. For children under six years old consult your doctor.
Reduce dosage if nervousness, restlessness, or sleeplessness occurs.
What should you do if your child is under six years old

A.You should let him take two tablets a day
B.You should reduce the dosage anyway.
C.You should find the directions on the bottle.
D.You should ask the doctor for advic