Final answer:
The index of hydrogen deficiency (IHD), or degree of unsaturation, for gestrinone cannot be determined without the molecular formula.
Step-by-step explanation:
The index of hydrogen deficiency (IHD), also known as the degree of unsaturation, is used in organic chemistry to determine the number of multiple bonds or rings present in a molecule. To calculate the IHD, you need to know the molecular formula of the compound. In the case of gestrinone, the molecular formula is not provided, so it is not possible to determine the IHD. Therefore, the correct answer is not listed among the options A, B, C, D, or E.