Definition: You are given a question on virology. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: The characteristic of injecting drug users in Asia is/are:
(A)Strong family support (B)Low failure rate for rehabilitation centers (C)Remaining a member of the community (D)Both a and c

D