Task: Text Categorization
Input (English): Question: In the filtration process, the flow velocity is: 
 Options:  <0> Directly proportional to the quantity of the cake deposited. <1> Directly proportional to the amount of materials in suspension. <2> Dependent on the degree of ionization of the substance to be filtered. <3> Dependent on the ambient temperature. <4> Inversely proportional to the quantity of the cake deposited.
Output (English): pharmacology