This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
Which of the following is the most severe form of Diptheria 
Select and explain. 
A. Nasal, B. Cutaneous, C. Nasopharynx, D. Laryngopharynx
D: Laryngopharynx
Answer: D: Laryngopharynx 
Explanation: Ref: Harrisons, 19th ed. pg. 978* Diptheria is a nasopharyngeal and skin infection caused by Corynebacterium diphtheriae. Toxigenic strains of C. diphtheria produce a protein toxin that causes systemic toxicity, myocarditis, and polyneuropathy.* The toxigenic strains cause pharyngeal diphtheria, while the non-toxigenic strains commonly cause cutaneous disease.* Harrisons states: "Respiratory/pharyngeal form of diphtheria is from notiable diseases, while cutaneous diphtheria is NOT"* Most severe form of diphtheria: Laryngeal