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
Operation theatre sterilisation is done by 
Select and explain. 
A. savlon cleansing, B. Carbolic acid spray, C. Ultra violet radition, D. Autoclave
C: Ultra violet radition
Answer: C: Ultra violet radition 
Explanation: UV rays are used to disinfect OT for 30-45 min exposure Formaldehyde gas also can be used for fumigation of operation theatres. Ref : Ananthanarayana textbook of Microbiology 9th edition Pgno : 33