This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vascular surgery, Subject name: Surgery
Raynauds phenomenon is commonly seen in 
Select and explain. 
A. Upper limb of female, B. Lower limb of female, C. Lower limb of male, D. Upper limb of male
A: Upper limb of female
Answer: A: Upper limb of female 
Explanation: . It is an episodic vasospasam,especially aeriolar spasam usually bilateral more often seen in upperlimb of females as a result of abnormal sensitivity to cold.Patient develops blanching,cyanosis qnd later flushing .usually medial four digits and palm are involved.Thumb is spared.If vasospasam becomes longer,gangrene or ischemic ulceration supervenes along the tips of fingers. Refer page no 183 of SRB's manual of surgery5th edition.