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
Sporicidal disinfectant is all of the following, except: 
Select and explain. 
A. Glutaraldehyde, B. Formaldehyde, C. Ethylene oxide, D. Benzalkonium chloride
D: Benzalkonium chloride
Answer: D: Benzalkonium chloride 
Explanation: Sporicidal agents are :
E – Ethylene oxide  F – Formaldehyde  G – Glutaraldehyde
H – Halogens (moderate action on spores)

Benzalkonium chloride is Quaternary ammonium (cationic) antiseptic which are not sporicidal.

KDT 6/e, p 860

Phenol and Hexachlorophene are poor sporicidal.