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.
Hydroxycitric acid (HCA) is a substance found in tropical plants, such as Garcinia cambogia. It is traditionally used in Indian and Thai cooking. However, it is also commonly used in weight loss supplements. (Click HCA Uses for more information.)