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: Microbiology
True about cryptococcus are all except 
Select and explain. 
A. Primarily infects lung, B. Urease negative, C. India-ink is used, D. All are true
B: Urease negative
Answer: B: Urease negative 
Explanation: Ans. is `b i.e., Urease negative CRYPTOCOCCUS NEOFORMANS The only pathogenic yeast Four capsular serotypes - A, B, C and D It has polysaccharide capsule Most infections in immunocompromized patients are caused by serotype A. Pigeon droppings commonly contains serotype A and D. Eucalyptus tree contain serotype B. It is urease positive. Mode of transmission By inhalation of the fungus into the lung (most common) Through skin or mucosa (some times).