This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Efalizumab is used in treatment of: 
Select and explain. 
A. Acne vulgaris, B. Atopic dermatitis, C. Psoriasis, D. All of the above
C: Psoriasis
Answer: C: Psoriasis 
Explanation: Efalizumab (Raptiva) is an immunosuppressive recombinant humanized IgG1 kappa isotype monoclonal antibody that binds to the CD11a subunit of leukocyte function antigen-1. This binding affects the activation, adhesion, and migration of T lymphocytes. The recommended dosage in psoriasis is a single 0.7 mg/kg subcutaneous injection conditioning dose followed by weekly subcutaneous injections of 1 mg/kg not to exceed a maximum single dose of 200 mg. Ref: Katzung 11th edition Chapter 61.