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.
A: HCTZ is a commonly used abbreviation for the medication, hydrochlorothiazide. Hydrochlorothiazide is a diuretic or water pill that can be used to treat hypertension (high blood pressure) and edema (fluid retention). Hydrochlorothiazide helps the kidneys eliminate unneeded salt and water from the body.