**Core Concept**
The description provided suggests an infection caused by a specific type of bacteria that is known for its distinctive appearance and characteristics. The presence of rod-shaped bacilli, green color, and bluish-purple granules points towards a particular pathogen.

**Why the Correct Answer is Right**
The correct answer is related to the identification of the bacteria. The description matches the characteristics of Corynebacterium diphtheriae, which is a rod-shaped bacterium that can produce a toxin causing diphtheria. The green color and bluish-purple granules are due to the presence of metachromatic granules, which are inclusions within the bacterial cells. The growth of this bacterium can lead to the formation of a pseudomembrane on the surface of tonsils, which can cause respiratory obstruction and other complications.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not match the description provided. The bacterium described does not have a similar appearance or characteristics.

**Option B:** This option is incorrect because it does not describe the correct pathogen. The bacterium described is not a type of Streptococcus, which is a different genus of bacteria.

**Option C:** This option is incorrect because it does not match the description provided. The bacterium described does not have a similar appearance or characteristics.

**Option D:** This option is incorrect because it does not describe the correct pathogen. The bacterium described is not a type of Haemophilus, which is a different genus of bacteria.

**Clinical Pearl / High-Yield Fact**
Corynebacterium diphtheriae can be identified by its distinctive appearance under microscopy, which includes the presence of metachromatic granules and a characteristic "V" or "L" shape. This bacterium can cause severe respiratory complications if left untreated.

**Correct Answer:** C. Corynebacterium diphtheriae