Task: Text Categorization
Input (English): Question: The first stage of the mechanism of dehydration of cyclohexanol with H2SO4 is: 
 Options:  <0> Loss of OH-. <1> Formation of an ester sulfate. <2> Protonation of alcohol. <3> Loss of H + by alcohol. <4> Elimination of H2O from alcohol.
Output (English): chemistry