Index: lams_tool_assessment/src/java/org/lamsfoundation/lams/tool/assessment/service/AssessmentServiceImpl.java
===================================================================
diff -u -r06bf1c491a054104ea4e5cc55fc867af5519c200 -re34e0b7a8ed604692164d998b9a7d6944adfc487
--- lams_tool_assessment/src/java/org/lamsfoundation/lams/tool/assessment/service/AssessmentServiceImpl.java	(.../AssessmentServiceImpl.java)	(revision 06bf1c491a054104ea4e5cc55fc867af5519c200)
+++ lams_tool_assessment/src/java/org/lamsfoundation/lams/tool/assessment/service/AssessmentServiceImpl.java	(.../AssessmentServiceImpl.java)	(revision e34e0b7a8ed604692164d998b9a7d6944adfc487)
@@ -667,6 +667,9 @@
 	    }
 
 	} else if (questionDto.getType() == AssessmentConstants.QUESTION_TYPE_SHORT_ANSWER) {
+	    //clear previous answer
+	    questionResult.setSubmittedOptionUid(null);
+	    
 	    for (OptionDTO optionDto : questionDto.getOptionDtos()) {
 
 		//prepare regex which takes into account only * special character