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: Pathology
Allergy to penicillin group of drugs is classified as 
Select and explain. 
A. Type 1 reaction, B. Type 2 reaction, C. Type 3 reaction, D. Type 4 reaction
A: Type 1 reaction
Answer: A: Type 1 reaction 
Explanation: None