Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
If the calculated activity (CI) is  4.96×10 −11, what is the specimen weight/size?

### Inputs:
table_name: table, columns: ['Specimen weight/size', 'Calculated activity ( Bq )', 'Calculated activity ( Ci )', 'Estimated activity GR(api)', 'Estimated exposure ( mRem )/hr*']

### Response:
SELECT Specimen weight/size FROM table WHERE Calculated activity ( Ci ) = 4.96×10 −11