Microbiology Which one of the following is False A Theobald - smith phenomenon is a type I hypersensitivity reaction B Serum sickness is a type II hypersensitivity reaction C Allograft rejection is a type IV hypersensitivity reaction D Transfusion reaction is a type II hypersensitivity reaction 💡 Explanation Which one of the following is False ✓ Correct Answer: B. Serum sickness is a type II hypersensitivity reaction