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: Social & Preventive Medicine
A hospital has always some beds vacant for emergency, isolation, emergency etc. These vacant beds are known as: 
Select and explain. 
A. Essential bed space, B. Mandatory bed space, C. Dead bed space, D. None of the above
C: Dead bed space
Answer: C: Dead bed space 
Explanation: A hospital has always some beds vacant for emergency, isolation, emergency etc. These vacant beds are known as dead bed space. This accounts for around 15 to 20%. Ref: Textbook of community medicine, S. Lal, 3rd edition pg: 686.