<apex:pageBlockSectionItem >
<apex:outputLabel value="{!$ObjectType.Visit__c.fields.Activity_Type__c.label}"/>
<apex:outputPanel layout="block" styleClass="requiredInput">
<apex:outputPanel layout="block" styleClass="requiredBlock"/>
<apex:selectList value="{!v.Activity_Type__c}" size="1" required="true">
<apex:selectOptions value="{!list_activityTypes}"/>
</apex:selectList>
</apex:outputPanel>
</apex:pageBlockSectionItem>