
Passage: Researchers have found that eating more than five servings of yam, corn, carrots, onions or other similar vegetables a day can reduce the risk of pancreatic cancer. They surveyed 2230 respondents, including 532 patients with pancreatic cancer, then classified the agricultural products eaten by cancer patients and asked them about their other living habits, such as overall diet and smoking. Compare it with the living habits of the other 1701 people.It was found that people who ate at least five servings of vegetables a day were half as likely to develop pancreatic cancer as those who ate less than two servings of vegetables a day.
Question: Which of the following options does not question the reliability of the above findings?
A. A.Is what the interviewees said in the survey true?
B. B.What is the proportion of men and women in patients with pancreatic cancer?
C. C.Are there any significant omissions in the differences in living habits between pancreatic cancer patients and non-pancreatic cancer patients involved in the survey?
D. D.Are there any genetic reasons for pancreatic cancer?
Answer: