Dog days means the hottest or most tiring days of a period. 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: Dog days can refer to the hottest or most tiring days of a period.
• Story example: A writer may use Dog days when describing the hottest or most tiring days of a period.
• Exam example: When a sentence contains Dog days, choose the meaning “the hottest or most tiring days of a period.”