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: Biochemistry
Which of the following is suitable test performed for diagnosis of intestinal malabsorption? 
Select and explain. 
A. BT-PABA test, B. Hydrogen breath test, C. D-xylose test, D. Stool fat estimation
D: Stool fat estimation
Answer: D: Stool fat estimation 
Explanation: Intestinal malabsorption is tested by stool fat estimation. Fat digestion and absorption being more complex is often first to be affected compared to carbohydrate and protein metabolism.