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: Microbiology
Griffith demonstrated transformation with ? 
Select and explain. 
A. H. influenzae, B. E. col i, C. Proteus, D. Pneumococcus
D: Pneumococcus
Answer: D: Pneumococcus 
Explanation: Ans. is 'd' i.e., Pneumococcus