fix show ans

app.py

@@ -101,7 +101,7 @@ def reset_state():
 def show_hide_answer(answer, show_ans):
     if show_ans:
         show_ans = False
-        return gr.update(value=""), gr.update(value="Show Answer")
+        return gr.update(value=""), gr.update(value="Show Answer"), show_ans
     else:
         show_ans = True
         return gr.update(value=answer), gr.update(value="Hide Answer"), show_ans