This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
A patient exhibits swelling of the ankles and a bloated abdomen and has a history of malnutrition. The bloated abdomen is probably caused by? 
Select and explain. 
A. Increased intestinal gas, B. Slow, chronic abdominal hemorrhage, C. Increased capillary hydrostatic pressure, D. Decreased capillary colloid osmotic pressure
D: Decreased capillary colloid osmotic pressure
Answer: D: Decreased capillary colloid osmotic pressure 
Explanation: In long-standing protein-energy malnutrition, protein catabolism takes place. Blood albumin level decreases. Which leads to decreased colloidal osmotic pressure in the capillaries.This causes increased capillary permeability and edema results.(Ref: Ganong&;s Review of medical physiology, 24th edition)