So, basically, withholding information is not the same thing as lying, but depending on the situation, you will have to decide whether it is better to withhold the information or not.
HCH may refer to: Hampton Court House, an independent school in Surrey, UK. Hexachlorocyclohexane, a group of chemical compounds. Holmes Chapel railway station (National Rail station code), in Cheshire, England.
MCH stands for mean cell hemoglobin. This is a measure of the amount of hemoglobin associated with each red cell. MCHC stands for mean cell hemoglobin concentration. This value represents the mean hemoglobin concentration in each red blood cell.