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
A PTT is required for monitoring of ? 
Select and explain. 
A. Streptokinase, B. Warfarin, C. Heparin, D. Tranexamic acid
C: Heparin
Answer: C: Heparin 
Explanation: Ans. is'c'i.e., Heparin(Ref KDT &/e p. 598, 599; Katzung llnle p. 592)