This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: general microbiology, Subject name: Microbiology
Obligatory intracellular organism is - 
Select and explain. 
A. Mycoplasma, B. Chlamydae, C. Cryptococcus, D. H.pylori
B: Chlamydae
Answer: B: Chlamydae 
Explanation: Obligatory intracellular organism: they are those organisms who cannot multiply or reproduce outside the host cell but require the resources of the host cell to synthesis enzymes and multiply or reproduce chlamydia is an obligate intracellular bacterial parasite of humans animals and birds with tropism for squamous epithelial cells and macrophages of the respiratory and gastrointestinal tract Ref: Ananthanarayan & paniker's Textbook of Microbiology edition pg no:415