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: Pharmacology
Heparin is the commonly used anticoagulant in cardiac surgery. All of the following are true about heparin EXCEPT: 
Select and explain. 
A. Weakest acid found in living beings, B. Most commercial preparations of heparin are derived from pig intestine, C. Acts via antithrombin activation, D. Produce thrombocytopenia
A: Weakest acid found in living beings
Answer: A: Weakest acid found in living beings 
Explanation: Heparin is the strongest organic acid found in human beings.
It acts by activating AT-III that inhibits factor Xa and IIa.
Adverse effects of heparin are: Bleeding, Osteoporosis, Thrombocytopenia, Hypersensitivity, Alopecia.
Most commercial preparations of heparin are derived from ox lung and pig intestine.