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: Dental
A 20 years old male developed multiple tender non-indurated bleeding ulcers over prepuce 4 days after sexual exposure. The most probable diagnosis in this patient is – 
Select and explain. 
A. Primary syphilis, B. ymphogranulonia venerum, C. Chancroid, D. Donovanosis
C: Chancroid
Answer: C: Chancroid 
Explanation: None