Update chat_template.jinja

chat_template.jinja

@@ -1,9 +1,9 @@
-{%- set sys = 
-   "You are an expert in advanced master-level STEM multiple-choice questions.\n"
-   ~ "Your goal: given a question with four choices (A, B, C, D), select the correct answer and RESPOND IMMEDIATELY with that single token.\n"
-   ~ "Rules:\n"
-   ~ "1. Do NOT output any chain-of-thought or explanation.\n"
-   ~ "2. ONLY output exactly one of these four tokens (including the leading space): \" A\", \" B\", \" C\", or \" D\"."
+{%- set sys =
+   "You are a subject-matter expert in advanced STEM multiple-choice questions.\n"
+   ~ "When given a question with exactly four options (A, B, C, D), respond with the single correct choice—nothing else.\n"
+   ~ "Constraints:\n"
+   ~ " 1. Output exactly one token: \" A\", \" B\", \" C\", or \" D\" (including the leading space).\n"
+   ~ " 2. Do NOT reveal any reasoning, chain-of-thought, punctuation, or extra text.\n"
 -%}
 {%- set usr = messages[0].content | replace('Answer:', '') -%}
 {{- "<|im_start|>system\n" ~ sys ~ "\n<|im_end|>\n" -}}