A new birth control method for men known as RISUG for Reversible Inhibition of Sperm Under Guidance is under testing. The procedure involves injection of a nontoxic polymer inside of the vas deferens. The polymer forms a coating on the inner lining of vas deferens. As sperms pass through, they are chemically disabled by the polymer. Hence, there is ejaculation but the sperms are incapable of fertilising the egg. At any stage if needed, the polymer film can be dissolved and removed using specific injections.
What effect would the polymer have on the sperms?

Options

A. It may be preventing the sperms from moving ahead.
B. It may be damaging the membrane or the tail of the sperms.
C. It may be reversing the direction of movement of the sperms.
D. It may be controlling the frequency at which sperms are released.

Answer

To determine the effect of the polymer used in the RISUG method on sperm, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the RISUG Method**: The RISUG (Reversible Inhibition of Sperm Under Guidance) method involves injecting a non-toxic polymer into the vas deferens, which is the duct that carries sperm from the testicles to the urethra.

2. **Function of the Polymer**: Once injected, the polymer forms a coating on the inner lining of the vas deferens. As sperm travel through this duct, they come into contact with the polymer.

3. **Chemical Interaction**: The polymer is designed to chemically disable the sperm. This means that while sperm are still produced and ejaculated, they are rendered incapable of fertilizing an egg due to the chemical alteration caused by the polymer.

4. **Ejaculation Process**: During ejaculation, sperm are released, but because they have been chemically disabled by the polymer, they cannot successfully fertilize an egg.

5. **Reversibility**: If desired, the effects of the polymer can be reversed. Specific injections can dissolve the polymer coating, restoring the sperm's ability to fertilize an egg.

6. **Conclusion**: The primary effect of the polymer on sperm is that it chemically disables them, preventing them from fertilizing an egg while still allowing for ejaculation.

### Final Answer:
The polymer disables the sperm chemically, rendering them incapable of fertilizing an egg.

---