Task: Question Answering
Input (English): Question: Protein kinase A (PKA): 
 Options:  <1> It induces the synthesis of glycogen in response to an increase in glucagon in the blood. <2> It is a membrane protein that is activated in response to an increase in circulating GTP. <3> It is activated through the cAMP produced in response to an increase in adrenaline in the circulation. <4> It inhibits the lipolysis of triacylglycerides accumulated in adipose tissue, in response to an increase in intracellular cAMP. <5> It is a monomeric protein that inhibits the synthesis of ATP and muscle contraction.
Output (English): 3