Which property of monophasic currents may cause polarization and skin irritation?

• A. Monophasic currents deliver net charge causing polarization and skin irritation.
• B. Biphasic currents deliver net charge causing irritation.
• C. Biphasic currents are always balanced like DC.
• D. Monophasic currents deliver net charge causing polarization and skin irritation; biphasic currents are charge-balanced, reducing net charge and improving comfort and safety.

Answer: (D)