(a) whether small and medium enterprises play a key role in the manufacturing sector of the country;
(b) if so, the percentage-wise contribution of small and medium enterprises in the total production of the manufacturing sector during the years 2015-16, 2016-17 and 2017-18;
(c) whether some units of small and medium enterprises have also been closed down during the said period; and
(d) if so, the number of units closed during each year of the said period along with the reasons therefor?