This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
Which of the following causes both cutaneous and respiratory diphtheria 
Select and explain. 
A. Corynebacterium diphtheria, B. Corynebacterium ulcerans, C. Corynebacterium xerosis, D. Corynebacterium hoffmanii
A: Corynebacterium diphtheria
Answer: A: Corynebacterium diphtheria 
Explanation: C.diptheria causes both cutaneous and respiratory diphtheria. In the tropics, diphtheria bacilli infect the skin more than the respiratory tract. toxigenic diphtheria persists in the skin over three years. Cutaneous infections are secondary to pre-existing skin lesions. Ref: Textbook of microbiology; Ananthanarayan and paniker's; Pg 241; 10th Edition