单选题 After examining the patient, the doctors could find no physiological cause for his illness.
【正确答案】 C
【答案解析】psychological:心理学的;artificial:人造的,虚伪的;physical:物质的,肉体的;mental:心理的,精神的。题小physiological意为“生理学的,生理的”,故答案为C。