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
Ipilimumab is a 
Select and explain. 
A. Anti CD30 Monoclonal Antibody, B. PDL1 receptor inhibitor, C. CTLA4 inhibitor, D. PTPN22 inhibitor
C: CTLA4 inhibitor
Answer: C: CTLA4 inhibitor 
Explanation: Ipilimumab and Tremelimumab are CTLA4 inhibitors used in BRAF -ve malignant melanoma.