Task: Question Answering
Input (English): Question: The microbiocidal action of iodine and chlorine and many of its derivatives is due to: 
 Options:  <1> They are oxidizing agents. <2> They bind specifically to the active centers of the enzymes. <3> They bind specifically to ribosomal proteins. <4> They induce pores in the membranes. <5> They cause the dissolution of membrane phospholipids.
Output (English): 1