单选题 A nutritionist does diet studies by ______.

A、 asking the patient only about his general diet habit of having breakfast
B、 asking the patient to recall the nutritious food he ate in the past 24 hours
C、 asking the patient about how healthy he thinks he is
D、 asking the patient to provide a list of his daily diet

【正确答案】 D

【答案解析】该选项最具概括性，因而最切合题意。