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: Surgery
Injection sclerotherapy for varicose veins is by usinga) Phenolb) Absolute alcoholc) 70% alcohold) Ethanolamine oleate 
Select and explain. 
A. ad, B. c, C. ac, D. ab
A: ad
Answer: A: ad 
Explanation: Sclerosing agents mentioned in the latest editions of Schwartz, CSDT and Bailey are:
- hypertonic saline,
- sodium tetradecyl sulfate, and
- polidocanol
2 other sclerosants are mentioned in KDT 6/e p597

Ethanolamine oleate
Phenol in almond oil or Peanut oil