**Core Concept:** Carcinoma of buccal mucosa refers to malignant tumors originating from the buccal mucosa, which is the inner lining of the cheek in the oral cavity. The lymphatic drainage pattern plays a crucial role in determining the extent of treatment and monitoring the disease progression.

**Why the Correct Answer is Right:** Carcinoma of buccal mucosa commonly drains to the following lymph nodes sites:
1. **Option A:** Submandibular lymph nodes (located in the floor of the mouth, near the angle of the mandible)
2. **Option B:** Mylohyoid lymph nodes (located between the mylohyoid muscle and the mandible)
3. **Option C:** Parotid lymph nodes (located in the superficial and deep zones, near the parotid gland)
4. **Option D:** Infrahyoid lymph nodes (located in the anterior triangle of the neck, beneath the hyoid bone)

**Why Each Wrong Option is Incorrect:**
1. **Option A (Submandibular lymph nodes):** The submandibular lymph nodes are part of the deep cervical lymphatic chain, which is a separate chain from the buccal mucosa. Thus, these nodes are less likely to be involved in cases of buccal mucosa carcinoma.
2. **Option B (Mylohyoid lymph nodes):** Similar to option A, the mylohyoid lymph nodes are part of the deep cervical lymphatic chain, not the buccal mucosa chain. They are also not commonly involved in buccal mucosa carcinoma.
3. **Option C (Parotid lymph nodes):** The parotid lymph nodes are part of the superficial cervical lymphatic chain, separate from the buccal mucosa chain. Involvement of parotid lymph nodes indicates a more advanced disease and is less common in cases of buccal mucosa carcinoma.
4. **Option D (Infrahyoid lymph nodes):** Infrahyoid lymph nodes are part of the deep cervical lymphatic chain, not the buccal mucosa chain. Involvement of infrahyoid lymph nodes indicates a more advanced disease and is less common in cases of buccal mucosa carcinoma.

**Core Concept:** Carcinoma of buccal mucosa drains primarily to the deep cervical lymph nodes (level II, III, and IV) in the superficial cervical lymphatic chain.

**Why Each Wrong Option is Incorrect:**
1. **Option A (Submandibular lymph nodes):** These nodes are part of the deep cervical lymphatic chain and are less likely to be involved in cases of buccal mucosa carcinoma.
2. **Option B (Mylohyoid lymph nodes):** Similar to option A, mylohyoid lymph nodes are part of the deep cervical lymphatic chain and are less likely to be involved in cases of buccal mucosa carcinoma.
3. **Option C (Parotid lymph nodes):** Parotid lymph nodes are part of the superficial cervical lymphatic chain and, like infrahyoid lymph nodes, are less likely to be involved in cases of buccal mucosa carcinoma.
4. **Option