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
Women receiving oestrogen therapy have an increased risk of developing all of the following cancers, except? 
Select and explain. 
A. Breast cancer, B. Endometrial carcinoma, C. Carcinoma of gall bladder, D. Hepatocellular carcinoma
C: Carcinoma of gall bladder
Answer: C: Carcinoma of gall bladder 
Explanation: Ans. is 'c' i.e., Carcinoma of gall bladder o Carcinoma gall bladder is not an adverse effect of estrogen therapy. Other three cancers can occur on estrogen therapy.