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: Medicine
All of the following are sexually transmited, except 
Select and explain. 
A. Candida albicans, B. Echionococcus, C. Molluscum contagiosum, D. Group B streptococcus
B: Echionococcus
Answer: B: Echionococcus 
Explanation: None