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: Social & Preventive Medicine
For inventing which one of the following is Marc Koska best known ? 
Select and explain. 
A. Artificial blood, B. Disposable K1–syringe, C. Vaccine against Polio, D. ELISA test
B: Disposable K1–syringe
Answer: B: Disposable K1–syringe 
Explanation: None