Task: Text Categorization
Input (English): Question: Protein kinase A (PKA): 
 Options:  <0> It induces the synthesis of glycogen in response to an increase in glucagon in the blood. <1> It is a membrane protein that is activated in response to an increase in circulating GTP. <2> It is activated through the cAMP produced in response to an increase in adrenaline in the circulation. <3> It inhibits the lipolysis of triacylglycerides accumulated in adipose tissue, in response to an increase in intracellular cAMP. <4> It is a monomeric protein that inhibits the synthesis of ATP and muscle contraction.
Output (English): pharmacology