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: Medicine
All of the following are causes of microvesicular fatty liver except - 
Select and explain. 
A. Reye's syndrome, B. Obesity, C. Acute fatty liver of pregnancy, D. Valproic acid
B: Obesity
Answer: B: Obesity 
Explanation: None