I would also answer no but would attach a letter explaining exactly what happened. That way there is no question of you withholding relevant information.
Fingerprint result was positive after CIC sent me a request to do a test. Although the case was withdrawn for assault case, the RCMP result shows the case result with withdrawn stautus. My assumption was RCMP will destroy my fingerprints since the case was withdrawn 3 years back..but it is not. I am worried now, if I forward this result to CIC, what will be the consequences.