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
Oral contraceptive pill is useful in preventing all of the following except: 
Select and explain. 
A. Carcinoma breast, B. Carcinoma ovary, C. Pelvic inflammatory disease, D. Anaemia
A: Carcinoma breast
Answer: A: Carcinoma breast 
Explanation: None