Your water might be affected by iron, which is a commonly-occurring constituent of drinking water. Iron tends to add a rusty, reddish-brown (or sometimes yellow) color to water. If the color is more black than red, your water might contain a combination of iron and manganese.
That is this sign right here
D. bread, cereal, rice, pasta is your answer.
You should eat 3 - 5 servings of such these wholemeal food.
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No, because the risk is to high and they should keep it private.