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: Physiology
Thrombomodulin I is produced by all of the following EXCEPT 
Select and explain. 
A. Splanchnic circulation, B. Skin circulation, C. Cerebral circulation, D. Muscle circulation
C: Cerebral circulation
Answer: C: Cerebral circulation 
Explanation: C i.e. Cerebral circulation