Conditionally construct concrete class based on parameter

Is there a design pattern that lets me more efficiently instantiate my concrete classes, without having to rely on an if statement?

Suppose I have an inheritance set up like this:

public abstract class Asset
{
    public string Id {get; set;}
}

public interface ICalculable
{
    void Calculate();
}

public class Equity : Asset, ICalculable
{
    public decimal Price {get; set;}
    public void Calculate()
    {
        //...
    }
}

public class Options : Asset, ICalculable
{
    public int StrikePrice {get; set;}
    public void Calculate()
    {
        //...
    }
}

Then, I'm reading from rows of data and constructing my concrete classes:

List<Asset> listOfAssets = new List<Asset>();
for(var row in rows)
{
    Asset asset;
    if(row.AssetType = "Equity")
        asset = new Equity(row.CUSIP);
    else
        asset = new Options(row.strike_price);

    listOfAssets.Add(asset);
}