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
All of the following are general properties of Viruses except - 
Select and explain. 
A. May contain both DNA and RNA, B. Form extracellular infectious particles, C. Heat labile, D. Not affected by antibiotics
A: May contain both DNA and RNA
Answer: A: May contain both DNA and RNA 
Explanation: Properties of viruses 

Viruses are obligate intracellular parasites
They lack enzymes necessary for protein and nucleic acid synthesis and are dependent for replication on the synthetic machinery of host cells → so, they cannot grow in cell-free culture media.
They do not have a cellular organization.
They are unaffected by antibacterial antibiotics.
They contain only one type of nucleic acid, either RNA or DNA, never both.
They multiply by a complex process and not by binary fission.
The extracellular infectious virus particle is called the virion.
With few exceptions, viruses are very heat labile.