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
Growth on a cell-free artificial solid medium is possible for following except - 
Select and explain. 
A. Ureaplasma urealyticum, B. Mycoplasma pneumoniae, C. C and L form of proteus vulgaris, D. Chlamydia
D: Chlamydia
Answer: D: Chlamydia 
Explanation: None