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
One of the following drugs does not cause thrombocytopenia: 
Select and explain. 
A. Heparin, B. Phenobarbitone, C. Quinine, D. Thiazide
B: Phenobarbitone
Answer: B: Phenobarbitone 
Explanation: Phenobarbitone