Clearly the medicine

Clearly the medicine ______.

A．may be dangerous for small children

B．can't be taken by children under twelve years old

C．may be taken by children but not by adults

D．may be taken by adults but not by children

A解析：A选项意思为“这种药对小孩子来说可能有危险”，文中建议请教医生建议，最后一段也说药会引起不适，所以可以确认A选项为正确答案。其他选项的内容与原文不符，属于错误信息。