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: Microbiology
Which of the following is/ are not STD-a) HAVb) HPV c) HIVd) Varicella zoster viruse) HTLV-I 
Select and explain. 
A. ad, B. c, C. ac, D. ab
A: ad
Answer: A: ad 
Explanation: None