Please answer the question based on the following passage. You need to choose one letter from the given options, A, B, C, or D, as the final answer, and provide an explanation for your choice. Your output format should be ###Answer: [your answer] ###Explanation: [your explanation]. ###Passage:Researchers have found that eating more than five servings of yam, corn, carrots, onions, or other similar vegetables every day can reduce the risk of pancreatic cancer.They surveyed 2,230 respondents, including 532 patients with pancreatic cancer, and then classified the agricultural products consumed by the cancer, and asked them about other lifestyle habits, such as overall diet and smoking, and compared it with 1701 other people.Compare living habits.It was found that people who ate at least five servings of vegetables per day were half as likely to develop pancreatic cancer as those who ate less than two servings of vegetables per day. ###Question:Which of the following questions does not constitute a doubt about the reliability of the above research conclusion? ###Options: (A)Are all the interviewees saying in the survey true? (B)What is the proportion of men and women in patients with pancreatic cancer? (C)Is there an important omission in the differences in living habits between patients with pancreatic cancer and non-pancreatic cancer involved in the investigation? (D)Are there genetic causes for patients with pancreatic cancer? You should write your response with 250 or more words.
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