For how many pairs $(a,b)$ from $(1,2)$, $(3,5)$, $(5,7)$, $(7,11)$, the polynomial $P(x)=x^5+ax^4+bx^3+bx^2+ax+1$ has exactly one real root?

$ 
\textbf{(A)}\ 4
\qquad\textbf{(B)}\ 3
\qquad\textbf{(C)}\ 2
\qquad\textbf{(D)}\ 1
\qquad\textbf{(E)}\ 0
$
To determine for how many pairs \((a, b)\) the polynomial \(P(x) = x^5 + ax^4 + bx^3 + bx^2 + ax + 1\) has exactly one real root, we will analyze the polynomial for each given pair \((a, b)\).

1. **Rewrite the polynomial \(P(x)\):**
   \[
   P(x) = (x+1)(x^4 + (a-1)x^3 + (b-a+1)x^2 + (a-1)x + 1) = (x+1)Q(x)
   \]
   Here, \(Q(x) = x^4 + (a-1)x^3 + (b-a+1)x^2 + (a-1)x + 1\).

2. **Analyze \(Q(x)\) for each pair \((a, b)\):**

   - **For \((a, b) = (1, 2)\):**
     \[
     Q(x) = x^4 + 0x^3 + 2x^2 + 0x + 1 = x^4 + 2x^2 + 1 = (x^2 + 1)^2
     \]
     Since \((x^2 + 1)^2\) has no real roots, \(Q(x)\) has no real roots. Therefore, \(P(x) = (x+1)Q(x)\) has exactly one real root at \(x = -1\).

   - **For \((a, b) = (3, 5)\):**
     \[
     Q(x) = x^4 + 2x^3 + 3x^2 + 2x + 1
     \]
     We need to check if \(Q(x)\) has any real roots. Notice that:
     \[
     Q(x) = x^2(x+1)^2 + x^2 + (x+1)^2
     \]
     This form suggests that \(Q(x)\) is always positive for all real \(x\), hence \(Q(x)\) has no real roots. Therefore, \(P(x) = (x+1)Q(x)\) has exactly one real root at \(x = -1\).

   - **For \((a, b) = (5, 7)\):**
     \[
     Q(x) = x^4 + 4x^3 + 3x^2 + 4x + 1
     \]
     Evaluate \(Q(x)\) at specific points:
     \[
     Q(0) = 1, \quad Q(-1) = (-1)^4 + 4(-1)^3 + 3(-1)^2 + 4(-1) + 1 = 1 - 4 + 3 - 4 + 1 = -3
     \]
     Since \(Q(0) = 1\) and \(Q(-1) = -3\), by the Intermediate Value Theorem, there is at least one \(x\) in the interval \((-1, 0)\) such that \(Q(x) = 0\). Therefore, \(P(x) = (x+1)Q(x)\) has at least two distinct real roots.

   - **For \((a, b) = (7, 11)\):**
     \[
     Q(x) = x^4 + 6x^3 + 5x^2 + 6x + 1
     \]
     Evaluate \(Q(x)\) at specific points:
     \[
     Q(0) = 1, \quad Q(-1) = (-1)^4 + 6(-1)^3 + 5(-1)^2 + 6(-1) + 1 = 1 - 6 + 5 - 6 + 1 = -5
     \]
     Since \(Q(0) = 1\) and \(Q(-1) = -5\), by the Intermediate Value Theorem, there is at least one \(x\) in the interval \((-1, 0)\) such that \(Q(x) = 0\). Therefore, \(P(x) = (x+1)Q(x)\) has at least two distinct real roots.

3. **Conclusion:**
   Only for the pairs \((1, 2)\) and \((3, 5)\), the polynomial \(P(x)\) has exactly one real root.

The final answer is \(\boxed{2}\)