**Core Concept**
The pair of drugs in question acts as protectors of cancer chemotherapy by counteracting their toxic effects on rapidly dividing normal cells, such as those found in the bone marrow, gastrointestinal tract, and hair follicles.

**Why the Correct Answer is Right**
One such pair of drugs is Folinic acid (Leucovorin) and Amifostine. Folinic acid is used to prevent the toxic effects of methotrexate, a chemotherapeutic agent that interferes with DNA synthesis. Amifostine, on the other hand, is used to protect against the nephrotoxic effects of cisplatin, a chemotherapeutic agent that causes damage to the kidneys. These drugs act by either replenishing or enhancing the activity of enzymes involved in DNA synthesis or by scavenging free radicals that cause oxidative stress.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the pair of drugs mentioned does not have a well-established protective effect against chemotherapy.
* **Option B:** This option is incorrect because the pair of drugs mentioned does not have a well-established protective effect against chemotherapy.
* **Option C:** This option is incorrect because the pair of drugs mentioned does not have a well-established protective effect against chemotherapy.

**Clinical Pearl / High-Yield Fact**
It's essential to note that while these drugs can help mitigate the toxic effects of chemotherapy, they do not replace the need for proper dosing and monitoring of chemotherapeutic agents.

**Correct Answer:** C. Folinic acid (Leucovorin) and Amifostine.