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
Sympathectomy is indicated in all following conditions except 
Select and explain. 
A. Ischemic ulsers, B. Causalgia, C. Anhidrosis, D. Acrocyanosis
C: Anhidrosis
Answer: C: Anhidrosis 
Explanation: . Anhidrosis(absence of sweating)is the contraindication ,because hyperhidrosis is the indication of the sympathectomy.other ibdications include cervical rib with vascular manifestations,raynaud's phenomenon,causalgia,sudeck's osteodystrophy,upper limb vasospasam due to other causes etc.... Refer page no 187 of SRB's manual of surgery 5th edition.