Synthesize the process of GTP hydrolysis with the reassembly of the G protein subunits to explain signal termination.

• A. GTP hydrolysis activates adenylate cyclase, prolonging the signal.
• B. GTP hydrolysis inhibits protein kinase A, terminating the signal.
• C. GTP hydrolysis converts GTP to GDP, leading to the reassembly of the alpha subunit with beta gamma subunits, terminating the signal.
• D. GTP hydrolysis causes the dissociation of epinephrine from the GPCR.

Answer: (C)