Given the following context and answer, Check answer validity:
"""
context: "$instruction"

answer: "$output"

answer requirement: "$concept_to_infer"
"""

Validation criteria:
- If "$output" does not answers the context directly in one line，response No.
- If "$output" contains any word/explanation other than the $concept_to_infer，response No.
- Otherwise, response "Yes"

Response:

