Ethylene oxide is gas that:

• A. Requires special conditions when being used.
• B. Is potentially carcinogenic.
• C. Is used as a 37% aqueous solution.
• D. Is effective against all microorganisms except endospores and viruses.
• E. A and B.
• F. C and D.

Answer: (E)

Verified step by step guidance

1. Understand the properties of ethylene oxide: Ethylene oxide is a gas that is used for sterilization purposes. It is known for its ability to penetrate materials and kill microorganisms, but it requires specific conditions to be effective.
2. Recognize the health risks associated with ethylene oxide: It is potentially carcinogenic, meaning it can cause cancer in living tissue. This is an important consideration when handling or using ethylene oxide.
3. Identify the form in which ethylene oxide is used: Ethylene oxide is often used in a 37% aqueous solution, which means it is dissolved in water at this concentration for certain applications.
4. Evaluate the effectiveness of ethylene oxide against microorganisms: Ethylene oxide is effective against a wide range of microorganisms, but it is not effective against endospores and viruses. This limitation is crucial when considering its use for sterilization.
5. Determine the correct answer based on the given options: The problem states that the correct answer is A and B, C and D. This suggests that the statements regarding special conditions and carcinogenic potential (A and B) are correct, as well as the statements about its aqueous solution form and effectiveness against microorganisms (C and D).