<prompt> Which of the following is the agent of choice for cryosurgery?Nitrous oxideCO2 snowLiquid nitrogen sprayFreons  <response>: This has a temperature of -196 csprayprobe the only cryogen advocated for malignant skin lesions. Ref: Textbook of dermatosurgery cosmetology, satish S savant, E-2,P-117. 