This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
Which weight loss regime decreases risk of gall bladder stone 
Select and explain. 
A. 2 -3 Lt water per day, B. 2 - 3 Kg wt loss / month, C. Very low calorie diet, D. High fat diet
B: 2 - 3 Kg wt loss / month
Answer: B: 2 - 3 Kg wt loss / month 
Explanation: Answer- B. 2 - 3 Kg wt loss / monthRkk of gall stone formation in obese persons during active weight loss seems to increase in an exponential fasion. The data suggest that rates of weight loss should not exceed an average of 7.5 kg per week