Consider the two following statements $A$ and $B$, and identify the correct choice given in the answers : $(A)$ Duddell's thermo galvanometer is suitable to measure direct current only. (B) Thermopile can measure temperature differences of the order of $10^{-3}{ }^{\circ} \mathrm{C}$.

• A

  Both $A$ and $B$ are true
• B

  Both $A$ and $B$ are false
• C

  $A$ is true but $B$ is false
• Correct answer
  D

  $A$ is false but $B$ is true

Hence, the correct answer is option: 'D'.