Which one of the following is NOT correctly matched?

Q. Which one of the following is NOT correctly matched?
           (Substance) → (Use)

1. Silver bromide:: artificial photosynthesis
2. Silver iodide:: artificial rain
3. Lithium bicarbonate:: treatment of rheumatism
4. Milk of magnesia:: antacid

Answer: Silver bromide:: artificial photosynthesis

Explanation

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• Rainmaking, also known as artificial precipitation, artificial rainfall, and pluviculture, is the act of attempting to artificially induce or increase precipitation, usually to stave off drought or the wider global warming. According to the clouds' different physical properties, this can be done using airplanes or rockets to sow to the clouds with catalysts such as dry ice, silver iodide and salt powder, to make clouds rain or increase precipitation, to remove or mitigate farmland drought, to increase reservoir irrigation water or water supply capacity, to increase water levels for power generation, or even to solve the global warming problem.
• In 1843, lithium carbonate was used as a new solvent for stones in the bladder. In 1859, some doctors recommended therapy with lithium salts for a number of ailments, including gout, urinary calculi, rheumatism, mania, depression, and headache. In 1948, John Cade discovered the antimanic effects of lithium ions. This finding led lithium, specifically lithium carbonate, to be used to treat mania associated with bipolar disorder.
• Milk of Magnesia is a brand name for magnesium hydroxide, a medication used to treat constipation. Examples of antacids include Alka-Seltzer, Milk of Magnesia, Amphojel, Gaviscon, Gelusil, Maalox, Mylanta, Rolaids, Pepto-Bismol, Tums.