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: Medicine
Red cells are caught as innocent bystanders in the reaction between drug and antibodies against that drug, and develops hemolysis. Which drug is responsible for such a reaction? 
Select and explain. 
A. Penicillin, B. Sulfonamide, C. Naphthalene, D. Primaquine
A: Penicillin
Answer: A: Penicillin 
Explanation: After exposure red cells can be caught as innocent bystanders during the reaction between penicillin and antipenicillin antibodies. Ref: Harrison's principles of internal medicine, 18th edition, Page 881.