From the legislative nature of the activity of the Government, it is clear that the Government is under no obligation to make any disclosure of any information received and considered by it in making the order but in order to render effective the right to seek a review given to an aggrieved person we think that the Government, if so requested by the aggrieved manufacturer is under an obligation to disclose any relevant information which may reasonably be disclosed pertaining to 'the average cost of production of the bulk drug manufactured by an efficient manufacturer' and 'the reasonable return on net worth