Read the following and answer any four questions
Sohan went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was sad but after a futile argument, the man beat a hasty retreat.
Aqua regia dissolves:

Options

A. Gold and platinum
B. Gold and silver
C. Platinum and silver
D. Only gold

Explanation

### Step-by-Step Solution

1. **Understanding Aqua Regia**: Aqua regia is a powerful reagent that is a mixture of concentrated hydrochloric acid (HCl) and concentrated nitric acid (HNO3). The typical ratio used is 3 parts HCl to 1 part HNO3.

2. **Properties of Aqua Regia**: It is important to note that aqua regia is highly corrosive due to the strong acids it contains. This property makes it useful for various applications, including cleaning glassware and dissolving noble metals.

3. **Dissolving Metals**: Aqua regia is specifically known for its ability to dissolve noble metals such as gold and platinum. This is because the chlorine ions produced in the reaction can effectively react with these metals to form soluble compounds.

4. **Conclusion**: Therefore, the answer to the question regarding what aqua regia dissolves is that it dissolves gold and platinum.