This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
True about viroids is? 
Select and explain. 
A. Cause tumors in animals, B. Lack envelope like covering, C. Have only genetic material, D. Visible on light microscope
B: Lack envelope like covering
Answer: B: Lack envelope like covering 
Explanation: Viroids is a subviral agent that does not have an extracellular dormant ( virion) phase and has a genome that is much smaller than those of known viruses. REF:ANATHANARAYAN AND PANIKER'S TEXTBOOK OF MICROBIOLOGY 8TH EDITION PAGE NO:443