Which of the following statements refers to calcium:

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a) Recommended Ca daily allowance for males: 1. 1-10 years: 800 mg 2. 11-18 years: 1200 mg 3. 19-50 years: 1000 mg

4. > 51 years: 1000 mg

b) Ca chloride is very irritating and can cause necrosis if extravasated

c) In achlorhydric patients calcium carbonate should be given with meals to increase absorption or patient switched to calcium citrate, which is somewhat better absorbed

d) All of the above