Is job applicant required to disclose a medical or emotional condition?

For example, If an applicant has been treated for depression and if this has been an issue in past employment, does he have to tell the employer about it?
|Canadian Employment Law Today

Question:

Is an applicant obligated to disclose a medical or emotional condition that will affect their ability to do their job? For example, If an applicant has been treated for depression and if this has been an issue in past employment.

Answer: