维生素D<img src="/Image1/02/02cd96d3b613afa8bf8fd0c93661b029.gif" style="height: auto; max-width: 100%;" />的活性形式是（）<br>A:25-OH-D<img src="/Image1/02/02cd96d3b613afa8bf8fd0c93661b029.gif" /><br>B:1，25-（OH）<img src="/Image1/2a/2a2b6e575952d570147853cbe28636dc.gif" />-D<img src="/Image1/02/02cd96d3b613afa8bf8fd0c93661b029.gif" /><br>C:1，24，25-（OH）<img src="/Image1/02/02cd96d3b613afa8bf8fd0c93661b029.gif" />-D<img src="/Image1/02/02cd96d3b613afa8bf8fd0c93661b029.gif" /><br>D:24，25-（OH）<img src="/Image1/2a/2a2b6e575952d570147853cbe28636dc.gif" />-D<img src="/Image1/02/02cd96d3b613afa8bf8fd0c93661b029.gif" /><br>E:1，25-（NH）<img src="/Image1/2a/2a2b6e575952d570147853cbe28636dc.gif" />-D<img src="/Image1/02/02cd96d3b613afa8bf8fd0c93661b029.gif" />