A mixed blessing means something that has both good and bad effects. This answer is correct because the expression has a fixed figurative meaning in English. In an SSC idiom question, students should match the whole phrase with its accepted meaning rather than translate each word separately.

• Classroom example: A mixed blessing can refer to a situation involving something that has both good and bad effects.
• Story example: A writer may use A mixed blessing when describing a situation involving something that has both good and bad effects.
• Exam example: When a sentence contains A mixed blessing, choose the meaning “something that has both good and bad effects.”