A patient had a road traffic accident and was put on mechanical ventilation. He is opening his eyes on verbal command and is able to move all his 4 limbs spontaneously. What will be his GCS score?

**Core Concept**
The **Glasgow Coma Scale (GCS)** is a neurological scale used to assess the level of consciousness in a person after a brain injury. It consists of three components: eye opening, verbal response, and motor response. The scale helps in determining the severity of brain injury.

**Why the Correct Answer is Right**
The patient is able to open his eyes on verbal command, which corresponds to a score of 4 for eye opening. He is also able to move all his 4 limbs spontaneously, indicating a motor response score of 6. Since the patient is able to follow commands, his verbal response score would be 5, as he is able to respond to commands but the question does not specify the content of his verbal response.

**Why Each Wrong Option is Incorrect**
**Option A:** This option would be incorrect if the scores do not match the description given.
**Option B:** Similarly, this would not match if the sum of eye, verbal, and motor scores does not align with the clinical presentation.
**Option D:** This option is incorrect if the calculated GCS score based on the clinical description does not match this choice.

**Clinical Pearl / High-Yield Fact**
The GCS score ranges from 3 to 15, with higher scores indicating better neurological function. A key point to remember is that the minimum score (3) indicates deep unconsciousness, while the maximum score (15) indicates full consciousness.

**Correct Answer:** C. 15.