This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Microbiology
Ethylene oxide gas is used for sterilization of all EXCEPT 
Select and explain. 
A. Intercostal Drainage tube, B. Electric instrument, C. PVC tubes, D. Ventilator support system
B: Electric instrument
Answer: B: Electric instrument 
Explanation: (Electrical instrument): (38-Baveja 4th edition)ETHYLENE OXIDE (ETO) - specially used for sterilizing plastic and rubber articles, respirators, heart-lung mashines sutures, dental equipments and clothing* It is commercially used to sterilize disposable plastic syringes, petridishes* It has a high penetrating power and thus can sterilised prepackaged materials* Ethylene oxide sterilizer called as chemiclave* It is unsuitable for fumigation of rooms because of its explosive nature, irritant* Bacillus globigi (a red pigmented variant of Bacillus subtilis) has been used as biological control for testing of ethylene oxide sterilisers* Surgical instrument sterilized by - Autoclaving* Sharp instrument - 5% CresolUSES OF GLUTARALDEHYDE(i) For sterilization of cystoscopes, endoscopes, and bronchoscope(ii) To sterilize plastic endotracheal tubes, face masks, corrugated rubber anaesthetic tubes and metal instrument