; or (2) any additional disease that— (A) the Secretary determines in regulations warrants a presumption of service-connection by reason of having positive association with exposure to an herbicide agent; and (B) becomes manifest within any period prescribed in such regulations. (c) Herbicide agent For purposes of this section, the term herbicide agent has the meaning given such term in section 1821(d) of this title. . (b) Clerical amendment The table of sections at the beginning of such chapter is amended by inserting after the item relating to section 1116A, as added by section 2, the following new item: 1116B. Presumption of herbicide exposure for certain veterans who served in Korea. . (c) Pending cases (1) Authority to stay The Secretary may stay a claim described in subparagraph (B) until the date on which the Secretary commences the implementation of section 1116B of title 38, United States Code, as added by subsection (a). (2) Claims described A claim described in this subparagraph is a claim for disability compensation— (A) relating to the service and diseases covered by such section 1116B