This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sexually transmitted diseases, Subject name: Dental
Donovanosis is caused by 
Select and explain. 
A. Calymmatobacter granulomatis, B. T. peenue, C. Chlamydia trachomatis, D. H. ducreyi
A: Calymmatobacter granulomatis
Answer: A: Calymmatobacter granulomatis 
Explanation: DONOVANOSIS:-Granuloma venerum. Fouh veneral disease. Granuloma inguinale tropicum.Organism:-Calymmatobacterium granulomatis/ Klebsiella granulomatis .(closed safety pin morphology)Clinical features:-1. Painless papule at the site of entry.Becomes ulcerated and gradually develops into characteristic elevated, beefy red ulcero-granulomatous masses that bleed easily.2. Males Site-prepuce, frenum, glans penis and penoscrotal junction.3. Females- labia majora, mons veneris, and fourchette.Complications:-1. Fluctuant swelling develops in the inguinal region due to subcutaneous involvement lymphatics and is referred to as pseudobubo formation.2. Squamous cell carcinoma.{Reference: IADVL textbook of dermatology, vishalakshi Vishwanath. Pg no. 128.}