Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
He appeared to be suffering from a severe mental （ ） and was sent to hospital. (order)
【正确答案】：DISORDER
【题目解析】：
本题考查常见名词的派生词。
有a可知，空缺处应填名词，severe和mental均为形容词，修饰所填名词，分析句意，“送到医院”，此处应指某种疾病，mental disorder意为“精神病”。
句意：他出现了严重的精神疾病，被送到了医院。