Effective reading of the Results and Discussion section involves identifying its structure and extracting relevant information. Read the following statements, and identify the information contained in these three parts, and match the statement of a, b, &c with1, 2, & 31. Limitations and how they were addressed 2. Key findings 3. Main results a. Consumption of black tea without milk caused nausea in three volunteers. (the 2nd sentence of Results) ————————b. We found that severely obese subjects with a high prevalence of diabetes and the metabolic syndrome lost more weight in a six-month period on a carbohydrate-restricted diet than on a fat- and calorie-restricted diet (the 1st sentence of discussion) ———————— c. This study proves a principle and does not provide clinical guidance; given the known benefits of fat restriction, future studies evaluating long-term cardiovascular outcomes are needed before a carbohydrate-restricted diet can be endorsed (the last sentence of paragraph 7, Discussion) （填空格式：例如123）