**Core Concept**
The question is testing the knowledge of the normal flora of the throat and tonsils. **Streptococci**, particularly **Streptococcus viridans**, are a common inhabitant of the oral cavity, including the throat and tonsils. These bacteria are part of the normal microbiota and play a crucial role in the development of the oral cavity.

**Why the Correct Answer is Right**
Streptococci, including **Streptococcus viridans**, are aerobic, gram-positive cocci that are commonly found in the oral cavity. They are part of the normal flora and are involved in the production of lactic acid, which contributes to the development of dental caries. These bacteria are also known to be involved in the formation of dental plaque and can cause endocarditis in susceptible individuals.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because while **Staphylococcus aureus** is a common inhabitant of the skin, it is not typically found in the throat and tonsils.
* **Option B:** This option is incorrect because **Haemophilus influenzae** is a pathogen that can cause respiratory tract infections, but it is not a common inhabitant of the throat and tonsils.
* **Option C:** This option is incorrect because **Candida albicans** is a fungus that is commonly found in the oral cavity, but it is not typically associated with the throat and tonsils.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that while **Streptococcus viridans** is a common inhabitant of the oral cavity, it can cause endocarditis in susceptible individuals, particularly those with pre-existing heart conditions.

**Correct Answer:** C. **Candida albicans**