单选题 Sometimes patients suffering from severe pain can be helped by "drugs" that aren't really drugs at all ______sugar pills that contains no active chemical elements.
【正确答案】 A
【答案解析】解析：or rather“更准确地说”；but rather“相反地”；rather than“而不是……”：otherthan“除了，不同于”。根据句意，本题答案为A。