This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Medicine
True about obstructive sleep apnea are all except 
Select and explain. 
A. Females affected more than males, B. Commonly associated with hypeension, C. Day time sleepiness is seen, D. >5 episodes of apnea per hour
A: Females affected more than males
Answer: A: Females affected more than males 
Explanation: Obstructive sleep apnea is defined as the coexistence of unexplained excessive daytime sleepiness with at least 5 obstructed breathing events (apnea or hypopnea) per hour of sleep.Male sex and middle age(40-65 years) are predisposing factors.It is associated with elevated 24-h mean blood pressure.The increase is greater in those with recurrent nocturnal hypoxemia,is at least 4-5 mmHg and may be as great as 10 mmHg in those with >20% aerial oxygen desaturations per hour of sleep.This rise probably results from a combination of surges in blood pressure accompanying each arousal at apnea/hypopnea termination and from the associated 24-h increases in sympathetic tone. Ref:Harrison's medicine-18th edition,page no:2187.