Surgical department admitted a 37-year-old patient with a big crushed wound of his left thigh 4 hours after he got this trauma. What is the main provision for successful prevention of gaseous gangrene?

Answer options

1. Injection of specific serum 30 000 U
2. Removal of necrotic tissues and timely surgical processing of the wound
3. Wound lavage with 6% solution of hydrogen peroxide
4. Infiltration of soft tissues around the wound with antibiotic solution
5. Injection of specific serum 3 000 U