If directors are common holding not less than 25% of voting power then loan given by holding to subsidiary attracts Section 185. In the given case it is asked if Subsidiary can give loan to Holding in respect of section 185.
My opinion would be YES, section 185 is attracted, loan can't be granted.
Reason :- Section- 185 says if company( it can be holding or subsidiary) grants loan or advance Directly or indirectly to Company( it can be holding or subsidiary) in whom director is interested i.e. holding not less than 25% of total voting rights in general meeting). Hence, Section 185 is attracted when holding company grants loan to subsidiary company.