delete answer when question is deleted
diff --git a/knowledge_base/doctype/question/question.py b/knowledge_base/doctype/question/question.py
new file mode 100644
index 0000000..5ddee6a
--- /dev/null
+++ b/knowledge_base/doctype/question/question.py
@@ -0,0 +1,8 @@
+class DocType:
+	def __init__(self, d, dl):
+		self.doc, self.doclist = d, dl
+		
+	def on_trash(self):
+		import webnotes
+		webnotes.conn.sql("delete from tabAnswer where question=%s", self.doc.name)
+		
\ No newline at end of file