Read the following context and choose the best option to answer the question.
Context: Nothing is more disappointing than hearing a gastric bypass patient brag that they did nt have to exercise to lose weight . Its true ; patients will lose weight without lifting a finger . In fact , for many , the lack of physical effort required to lose weight is an appealing part of weight loss surgery .
Question: Why did the person mentioned end up losing weight ?
Options: 
A. They had implemented a strict diet .
B. They had a lot of workouts to do it .
C. None of the above choices .
D. They had surgery .


D