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
All are true regarding diptheria toxin except : 
Select and explain. 
A. Toxin blocks elongation of protein, B. Beta lysogenic strain produces toxin, C. Iron is critical for toxin production, D. Toxin is necessary for local wound production
D: Toxin is necessary for local wound production
Answer: D: Toxin is necessary for local wound production 
Explanation: None