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: Medicine
Cluster headache is characterized by all, except: 
Select and explain. 
A. Affects predominantly females, B. Unilateral headache, C. Onset typically in 20-50 years of life, D. Associated with conjunctival congestion
A: Affects predominantly females
Answer: A: Affects predominantly females 
Explanation: Answer is A (Affects predominantly females) : Cluster headache affects predominantly males. Men are affected 3 times more often than women.